Abstract: A mouse device includes a casing and a roller module. The roller module is disposed within the casing. The roller module includes a scroll wheel, a magnetic ratchet, a supporting element and a permanent magnet. The scroll wheel includes a concave structure. The magnetic ratchet is disposed within the concave structure of the scroll wheel. While the scroll wheel is rotated, the magnetic ratchet is correspondingly rotated. The magnetic ratchet includes a ratchet frame and plural tooth structures. The plural tooth structures are discretely arranged on an inner surface of the ratchet frame. While the magnetic ratchet is rotated with the scroll wheel, the plural tooth structures of the magnetic ratchet are sequentially transferred through a region over the permanent magnet, and a magnetic attractive force between the corresponding tooth structure and the permanent magnet is generated.

Abstract: A display device includes a circuit board connected to one side of the first panel, wherein the circuit board includes a first pad, and a second pad adjacent to the first pad in a first direction, wherein the circuit board has a first side adjacent to the first panel, wherein the first pad and the second pad have a predetermined length in a second direction intersecting the first direction, wherein a pitch between the first pad and the second pad varies along the second direction from the first side surface of the circuit board.

Abstract: A method for controlling an input function, an apparatus for controlling an input function and a storage medium thereof are provided. The an input function control method is applied to a first device connected to a input device and includes: in response to detecting that an input device sharing function is enabled and an input event sent by the input device is monitored, intercepting the input event; and forwarding the intercepted input event to a second device connected with the first device.

Abstract: An input device is provided, which includes a circuit board, a Hall sensor and an input module. The circuit board has a processor and a connector electrically connected to the processor, in which the connector has a plurality of connection terminals. The Hall sensor is disposed on the circuit board. The input module is configured to be assembled on or removed from the circuit board. The input module has a connecting portion, in which when the input module is assembled on the circuit board, the connecting portion touches one group of the connection terminals, and a set of signals is outputted to the processor for the processor to identify the input module. A mouse including the above-mentioned input device is also provided.

Abstract: There is provided a bottom cover for being covered on an optical system. The bottom cover is attached in front of the optical engine. The bottom cover has a bottom surface for facing a working surface when the optical system is moving on the working surface, a first opening for emission light of the optical engine to go through and a second opening for reflected light from the working surface to go through. The bottom cover is further formed with guiding protrusions protruded out from the bottom surface toward the working surface and surrounding at least the second opening to guide soft materials on the working surface to away from the second opening.

Abstract: A detection device includes an input unit configured to receive an operation of a user, and a sensor provided in the input unit and configured to detect biological information of the user when the user operates the input unit.

Abstract: A computer mouse comprising a scroll wheel, a braking system operable to provide a braking force on the scroll wheel, and a sensor system operable to detect a force or motion of the scroll wheel in the first and second directions. In response to receiving a control signal to stop rotation of the scroll wheel in the first direction, the braking system applies the braking force on the scroll wheel when the sensor indicates that the force or motion of the scroll wheel is in the first direction and removes the braking force when the sensor indicates that the force or motion of the scroll wheel is in the second direction.

Abstract: A mouse accepts button press inputs at a button on the mouse upper surface to detect an input with a switch coupled to a first support. When pressure is applied by an end user to the button after the button activates the switch, the first support rotates towards a second support and a pressure sensor detects the amount of pressure applied at the button as an input with a value that varies in a range. The pressure sensor comprises a polydimethylsiloxane (PDMS) film with integrated silver electrodes that form upper and lower layers of capacitor electrodes to detect strain of a spring that biases the first support away from the second support.

Abstract: Computer mice for ambidextrous use are disclosed. An example mouse includes a based and a cover. The base may mount one or more electronic devices for sensing. The cover may be coupled to the base in a first orientation relative to the base in a first mode, may be detached from the base, and may be coupled to the base in a second orientation reverse to the first orientation in a second mode.

Abstract: The present disclosure relates to a touch sensing device and a coordinate correction method, and more particularly, to a technique of determining a degree, to which a drawn line is curved (a straight line/a curved line), according to gradient values of straight lines that can be generated by touch coordinates and adaptively correcting the coordinates.

Abstract: A cheat detection methodology is disclosed that relates to identifying cheaters making super-human movements in interactive programs. For example, users trying to outcompete their opponents in video games using large aim assists and aim bots that perform actions that are not feasibly human. The disclosed methodology substantially reduces or even eliminates the benefit that various cheating solutions offer. In one aspect, the disclosure provides a method of monitoring cheating in interactive programs. In one example, the method includes: (1) obtaining motion data corresponding to a user input device interacting with an interactive program, (2) segmenting data submovements from the motion data, (3) determining one or more attributes of the data submovements, and (4) detecting, based on the one or more attributes, the data submovements that are a deviation of human submovements.

Abstract: An eye-tracker (40) comprising: an imaging system (41) configured to capture images (41_o) of a user's eyes (11, 12), said images comprising information of the user's point of gaze on a display (25, 35) of a computer device (20, 30); a processing module (42) for processing the images (41_o) captured by the imaging system (41) and providing processed data comprising structured information (42_o); a multi-platform module (43) for converting the processed data comprising structured information (42_o) into data comprising serialized structured information (43_o) in a format understandable by a plurality of operating systems; and a connection module (60) coupled to an input/output port (51) of the eye-tracker (40) for connecting the eye-tracker (40) with a computer device (20, 30). A system comprising an eye-tracker (40) connected to a computer device (20, 30). A method for connecting an eye-tracker (40) and a computer device (20, 30).

Abstract: A quick waveform editing method based on a mouse, comprising: receiving an original waveform which needs to be edited and setting an editing task, wherein, the editing task comprises a single waveform editing or a full waveform editing, which is used to edit an edge waveform of at least a pulse wave waveform; monitoring a mouse event and determining the type of the mouse event, wherein, the type of the mouse event comprises a left button event, a mouse wheel event and a right button event; if the type of the mouse event is the left button event, receiving an occurrence of the left button event monitored, which has a selected edge, and moving the selected edge left by a predetermined distance; if the type of the mouse event is the mouse wheel event, receiving an occurrence of the mouse wheel event monitored, which has a selected edge, and moving the selected edge up or down by a predetermined distance; if the type of the mouse event is the right button event, receiving an occurrence of the right button event m

Abstract: A method of a navigation sensor circuit includes: monitoring at least one polling request signal sent from a microcontroller during a variable time interval, wherein the microcontroller is externally coupled to the navigation sensor circuit; calculating at least one polling rate of the microcontroller according to the at least one polling request signal; and dynamically adjusting a sensor frame rate of the navigation sensor circuit according the at least one polling rate, wherein an image sensor of the navigation sensor circuit operates and captures images to generate and output displacement data based on the sensor frame rate.

Abstract: An information handling system mouse has a plastic chassis that assembles without the use of metal screws to that the mouse more readily breaks down to recycle at end of life. The mouse chassis has a complete perimeter at a bottom side to accept a bottom surface within the interior and having the assembly gap hidden from view under the mouse when in normal use. An inner frame heat stakes to the chassis to provide structural support without metal coupling devices like metal screws.

Abstract: An information handling system mouse includes a sliding power button on a bottom surface that slides to actuate a power switch on and off. When slid to an on position, the sliding power button is freed to move inward to actuate a tactile button under the sliding power button, such as with an end user inward push. In the off position the sliding power button catches under lip that prevents an inward push at the tactile button. Dual motion of the sliding power button offers intuitive varied end user interactions with a single button structure to save space at the mouse bottom surface.

Abstract: An input device including a housing, a ring-shaped scroll wheel, and an integrated haptic unit inserted through the scroll wheel. The integrated haptic unit includes a bridging structure and a variable motion-resistance component coupled thereto. The variable motion-resistance component having a cylindrical body rotatable relative to the bridging structure. The scroll wheel being fixedly attached to the cylindrical body in a coaxial manner. The variable motion-resistance component being configured to vary a motion-resistance profile against a relative rotation motion between the cylindrical body and the bridging structure for defining a haptic behavior of the scroll wheel. The integrated haptic unit includes an inbuilt encoder to convert relative motion between the cylindrical body and the bridging structure as an output signal. The integrated haptic unit being mounted to the housing in a manner so as to suspend the integrated haptic unit and the scroll wheel from a portion of the housing.

Abstract: A movement amount detection system capable of accurately detecting a movement amount at a reference point of a moving body is provided. A movement amount detection system calculates a second movement amount at the reference point by using first movement amounts each of which is detected based on image data acquired by a respective one of the plurality of optical sensors, and inversely calculates a third movement amount at each of the plurality of places where a respective one of the plurality of optical sensors is disposed from the second movement amount, and the arithmetic processing unit determines an optical sensor that should be excluded in the calculation of the movement amount at the reference point of the moving body based on a difference between the first movement amount and the third movement amount at each of the plurality of optical sensors.

Abstract: In an embodiment, a modular augmented reality display is provided that incorporates prescription eyewear that can be used separately by the wearer. In an embodiment, an image is generated from a removable display attached to the eyewear and directed into the edge of a prescription lens, which acts as a waveguide. The image is internally reflected within the prescription lens, and is directed to the wearer by an image combiner embedded within the prescription lens. In an embodiment, the augmented reality display includes a wearable belt pouch that includes a battery and support electronics connected to the eyewear so that the weight on the eyewear is reduced.

Abstract: Methods and systems for providing computer implemented services using user input are disclosed. To obtain the user input, a passive human interface device may be used. The human interface device may include a magnet that may produce a magnetic field used to discern the user input. The magnet may be mechanically coupled to actuatable portions of the human interface device thereby facilitating both translation and rotation of the magnet responsive to actuations by a user. The translation and rotation of the magnet may be sensed and used to identify user input provided by the user.

Abstract: An information handling system mouse couples upper and lower housing portions with a central lock that insert though an opening of the lower housing portion to rotationally engage opposing cam surfaces. The upper and lower housing portions capture a printed circuit board that provides mouse functions without any screws or adhesives used to couple the mouse together. The mouse other than the printed circuit board is made of recyclable plastic that readily disassembles.

Abstract: A memory device includes a first memory group including plural first non-volatile memory cells capable of storing multi-bit data, and a second memory group including plural second non-volatile memory cells capable of storing single-bit data. A program operation controller builds the multi-bit data based on data inputted from an external device, performs a logical operation regarding partial data among the multi-bit data to generate a parity, programs the parity in the second memory group after programming the partial data in the first memory group, perform a verification operation regarding the partial data after a sudden power-off (SPO) occurs, recovers the partial data based on the parity and a result of the verification operation, and programs recovered partial data in the first memory group.

Abstract: Input devices having a deformable membrane and methods of their use are disclosed. In one embodiment, an input device includes a body, a deformable membrane coupled to the body such that the body and the deformable membrane define an enclosure filled with a medium, and an internal sensor disposed within the enclosure, the internal sensor having a field of view configured to be directed through the medium and toward a bottom surface of the deformable membrane. The input device further includes a controller configured to receive an output signal from the internal sensor corresponding to a deformation in the deformable membrane, determine a gesture based on the output signal from the internal, and provide a gesture signal corresponding to the gesture.

Abstract: A mouse device includes a roller module. The roller module includes a base member, a scroll wheel, a magnetic conductor, a swingable arm, a driving motor and an actuating element. The scroll wheel is installed on the base member. The magnetic conductor is located beside the scroll wheel. When the scroll wheel is rotated, the magnetic conductor is correspondingly rotated. The swingable arm is installed on the base member. The swingable arm includes a magnetic element. The swingable arm is swingable relative to the magnetic conductor. When the swingable arm is swung to a first position, the magnetic element is aligned with the magnetic conductor. Consequently, a magnetic attraction force between the magnetic element and the magnetic conductor is generated. When the swingable arm is swung to a second position, the magnetic attraction force between the magnetic element and the magnetic conductor is eliminated.

Abstract: The application herein provides a foldable mouse and the solution is: the mouse comprise a foldable substrate and a circuit board, wherein the foldable substrate includes at least five planes connected in sequence, two planes of the foldable substrate are connected by means of a detachable connection, in case that these two planes are not connected, the foldable substrate can be unfolded, in the case that there two planes are connected, the foldable base plate can be folded to be a bent pyramid, and the circuit board is arranged on the inner side of the foldable base plate. This application can fold the mouse to make it easy to be carried.

Abstract: A motion-enable device includes a mechanical switch and a capacitive sensor with a sensing region that is located adjacent to the mechanical switch. The mechanical switch enables a first signal when closed or actuated that indicates that the mechanical switch is in an active state. The capacitive sensor enables a second signal when a conductive object is disposed in the sensing region, where the second signal indicates that the capacitive sensor is in an active state. Enablement of operation of an apparatus depends on receipt of both the first signal and the second signal. The mechanical switch and the capacitive sensor act as the two separate switches required by functional safety requirements for a motion enable device. Because the sensing region of the capacitive sensor is adjacent to the mechanical switch, the first and second signals are generated when an operator actuates the mechanical switch with a single digit.

Abstract: A mouse includes a main housing, a key structure, and a pressing force adjusting component. The key structure has a connecting end, a free end, and an elastic section. The connecting end is connected to the main housing, and the elastic section is located between the connecting end and the free end. The pressing force adjusting component is movably disposed on the main housing and has a limiting portion, and the limiting portion limits elastic deformation of the elastic section. A location of the pressing force adjusting component on the main housing is adapted to be changed to change a location of the limiting portion at the elastic section.

Abstract: The present application relates to a technical field of intelligent control device, particularly to a mouse control method, which includes: receiving a connection signal for establishing a bluetooth connection with a mobile phone in real time; receiving an operation signal associated with the mobile phone, and the operation signal includes a page turning operation signal, a pausing playing operation signal, a starting playing operation signal; sending a corresponding operation instructions to the mobile phone based on the operation signal. The present application is convenient for the user to use the mobile phone and the computer together.

Abstract: An electronic device and a method for operating the electronic device are provided. The electronic device includes a housing which includes a first surface and a second surface facing the first surface, a display which is disposed on at least a part of the first surface, a proximity sensor which is disposed between the display and the second surface, an illuminance sensor, and a processor which is operably connected to the display and the illuminance sensor, wherein the processor is configured to activate the display and the illuminance sensor in response to the occurrence of an event, measure, by using the illuminance sensor, illuminance of a region where the electronic device is disposed, confirm the characteristic of an input occurring on the display by an external object, and determine, based on the measured illuminance and the characteristic of the input, whether or not to inactivate a touch input reception function of at least a partial region of the display.

Abstract: A mouse device includes a body, a cover plate, a covering layer, and an adhesive layer. The cover plate is disposed on the body and includes a button. The covering layer covers the cover plate, and the material of the covering layer is different from the material of the cover plate. The adhesive layer is bound between the cover plate and the covering layer, and the adhesive layer has a hollow portion corresponding to the button.

Abstract: The present invention discloses a scroll wheel module, which comprises a bracket and a rotatable scroll wheel that is arranged on the bracket. The scroll wheel is equipped with a hand feel member that provides flipping tactile. The scroll wheel module further comprises an electronic control adjustment assembly, which is used to adjust the magnitude of damping that the hand feel member exerts on the scroll wheel. By tactfully combining the electronic control adjustment assembly with the hand feel member, the present application can adjust the height of the tilting end simply and quickly by means of the electronic control adjustment assembly, further adjust the distance between the hand feel end of the hand feel member and the inner ring of the scroll wheel, and finally manage to adjust different kinds of tactile sense about the damping while rolling the scroll wheel.

Abstract: A foldable computer mouse is provided that includes a deformable body formable into an expanded configuration usable for receiving inputs for controlling a computing device and a folded configuration. The expanded configuration being an arcuate configuration having a first curvature and the folded configuration having a second curvature greater than the first curvature. The mouse also includes a hollow shell disposed on a top surface of the deformable body. The shell expands based at least on the deformable body being formed into the expanded configuration, and the shell collapses against the top surface of the deformable body based at least on the deformable body being folded into the folded configuration. The shell comprises a flexible material that retains a shape of the shell in the expanded configuration.

Abstract: A web site publisher may improve user interaction with landing pages from third-party publishers by displaying landing page content in a navigation window offering users the ability to interact with one or more landing pages in formats including: carousel, multiple panes, stacks, tabs, and tiles. Pages may be displayed in focus, below or behind the active display area, in full size windows, in reduced windows, and so forth. Landing page content may be loaded in advance of a user focusing on a specific page. The navigation window offers users the ability to store preferences, to refresh landing pages, to save searches, to search in one landing page, and/or to have results propagate to other landing pages.

Abstract: A secure operation method for an icon based on a voice-screen-mouse ternary verification includes verifying and comparing an icon associated with an operator's voice, an icon displayed on the screen to specify an operation, and an icon to which the mouse points when the mouse stops moving, and providing permission for operation and warning by a system. An association between a specific voice and the icon is established first. An associated icon is activated by a voice input of a voice recognition system, and then verification and comparing is performed with the icon to which the mouse points when the mouse stops moving. For the touch screen computer and mobile terminal, the binary verification is performed through the icon associated with the operator's voice and the icon displayed on the screen to specify the operation. The system provides authorization for the operation.

Abstract: A computer mouse has a mouse button face with at least one mouse button for operation by a finger of a user and a thumb face opposite of the mouse button face for engagement by a thumb of that user. At least one sensor is provided for detecting a mode of operation by a user. In a first detected mode of operation, a displacement operation by a user causes a user interface display of a computer system to show a movement in a direction in a displayed image. In a second detected mode of operation, the same displacement operation by a user causes the user interface display to show a different movement in a different direction in the displayed image. Also described is a mouse with a touchpad surface area partially located between mouse buttons, partially overlapping the buttons and partially in flexible hinge areas of caps of the buttons.

Abstract: The invention provides an input device including a holder, a first wheel, a slider, and a first pressure part. The first wheel is disposed on the holder, and includes a side surface, a circle center, and a segment adjusting structure. The segment adjusting structure is disposed on the side surface in a manner of surrounding the circle center. The slider is disposed on the holder, and is movable relative to the holder to move toward or away from the circle center. The first pressure part includes two first ends. One of the first ends is connected to the slider, and as the slider moves toward or away from the circle center, interference between the other first end and the segment adjusting structure is increased or reduced.

Abstract: A mouse device includes a housing and a wheel module. The housing includes an outer accommodating slot. The wheel module is detachably disposed in the outer accommodating slot. The wheel module includes a mounting base and a wheel. The mounting base has two opposite side walls, and the mounting base is located at a bottom of the outer accommodating slot. The wheel has two opposite pivots, wherein the two pivots are connected to the two side walls of the mounting base respectively.

Abstract: There is provided a computer mouse, in an unibody or modular form, which incorporates IoT capabilities and the flexibility to install and interchange different types of functional apparatuses and accessories, such as a monitor, microphone, sensors, and characters/figurines. This multiple application computer mouse interacts mechanically, electronically, visually and/or orally with the user or third parties. Internal and external structures house additional and/or extended electronic boards and connectors which manage, interface and/or detect the signals obtained from the functional apparatuses and/or characters installed in the hub section of this computer mouse, and receive and/or send signals to an external device, such as a computer, monitor, sensors or other devices or software installed in apparatuses of the internet cloud.

Abstract: A display control system using a knob includes an input part which receives at least one piece of position information of a knob within a movement range in an area under a display and position information of the knob within a preset plane area, a memory in which a display control program using the position information of the knob is stored, and a processor which executes the program, and the processor controls a function in a vehicle in consideration of the position information according to movement of the knob and operation information of the knob.

Abstract: An improved way of managing the labor expended on a construction project, whether a small-scale or large-scale, includes a system, program and method that will use the estimate of labor for a project as an input to the labor management system. The percent complete of the project will be a calculation of installed equipment as opposed to a perceived percent complete of the project. The calculation will be compared to the percent of labor hours used to then determine the state of the construction project. The labor management calculation will be facilitated through a user interface where the user can highlight one or more portions of the virtual project, where the one or more portions represent one or more installed units of the project, such as installed equipment.

Abstract: A mouse device includes a casing, a key module and a stopping assembly. The key module includes a switch and a keycap. When the keycap is in a pressable state and the keycap is pressed in response to an external force, the keycap is moved toward the switch to trigger the switch. The stopping assembly is disposed within the casing and aligned with the key module. The stopping assembly includes a movable block, a push block and a stopper. While the movable block is pushed and moved in response to a pushing force, the push block is correspondingly moved. While the push block is moved, the stopper is pushed by the push block, and the stopper is moved toward a region between the keycap and the switch. When the keycap is stopped by the stopper, the keycap is switched from the pressable state to a non-pressable state.

Abstract: The present invention relates to an input device. The input device includes a circuit board, a wheel, a supporting frame, a push button switch and a tilt switch. The wheel has a rotary shaft. The supporting frame includes a body, an extension arm, a first and a second supporting portion. The wheel is pivotally connected to the body by the rotary shaft. The extension arm is disposed at the side edge of the body. The first and second supporting portion are connected to the body, where the second supporting portion is disposed between the rotary shaft and the first supporting portion. The push button switch is corresponding to the body. When the wheel is pressed, the body is driven to trigger the push button switch. The tilt switch is corresponding to the extension arm. When the wheel tilts, the extension arm is driven to trigger the tilt switch.

Abstract: A computer mouse include a base; a cover assembly releasably secured to the base and including an opening; and a rotational device disposed in the opening to rotatably secure to the base. The rotational device includes a disc-shaped external rotational member including a circular flange on one surface, the circular flange disposed through the opening to rotatably secure to the base, the circular flange having a through hole; and a disc-shaped internal rotational member partially disposed in the through hole.

Abstract: An electronic device may include a housing (100), a display (102) disposed in the housing (100) and including an interface surface (112) arranged for user contact and a reference haptic (108). The interface surface (112) includes an active haptic output that provides a time-dependent haptic output and a reference haptic (108) disposed on the housing or the interface surface to provide a time-independent haptic output related to the time-dependent haptic output. The combination of active and reference haptics on an electronic device, such as a wearable display device, can convey information to a user without requiring the user to look at the device.

Abstract: Disclosed are a magnetic roller damping device and an implementing method thereof. The device includes a magnetic roller and a magnetic damping mechanism. The magnetic roller includes a first multipole magnet that includes at least one pair of magnetic poles with opposite polarities. The magnetic damping mechanism uses a magnetic damping magnet or metal attractable to the first multipole magnet, the magnetic damping magnet or metal is positioned in a magnetic field of the first multipole magnet, and a distance between the magnetic damping magnet or metal and the magnetic roller is adjustable.

Abstract: In some aspects, the disclosure is directed to methods and systems for a hybrid position and rate control input device comprising: a housing comprising an upper portion and a lower portion; a force-detecting sensor configured to detect a translation or rotation of the upper portion relative to the lower portion; a motion-detecting sensor within one of the upper portion and the lower portion of the housing, configured to detect motion of the housing relative to a surface; a communication interface positioned within the housing; and a processor positioned within the housing configured to select between a first translation signal from the motion-detecting sensor and a second translation signal from the force-detecting sensor; and transmit, via the communication interface to a computing device, the selected translation signal.

Abstract: A virtual reality (VR) or augmented reality (AR) system includes: a display configured to display a user interface to a user; an integrated scrollwheel and fingerprint sensor (FPS) user input apparatus, comprising a scrollwheel configured to detect a rotational navigation input from the user and an FPS configured to detect a biometric input from the user; and a processing system configured to: receive the rotational navigation input via the scrollwheel of the integrated scrollwheel and FPS user input apparatus; update a displayed user interface on the display based on the received rotational navigation input, wherein updating the displayed user interface comprises updating a user selection on a displayed menu; receive an activation input for the updated user selection on the displayed menu via the FPS of the integrated scrollwheel and FPS user input apparatus; and execute an operation corresponding to the updated user selection on the displayed menu.

Abstract: The disclosed method may include detecting motion of a user, estimating, for the detected motion of the user, effort expended by the user in performing the motion, determining, based on the detected motion and the estimation of expended effort, a haptic profile for conveying to the user a physical sensation of expending the effort, and simulating a sensation of expending the effort by executing the haptic profile in at least one haptic device that is worn by the user. Various other methods, systems, and/or computer-readable media are also disclosed.

Abstract: An optical switch module including a light generation circuit, a light receiving circuit, and a control unit is provided. The light generation circuit includes a light generation unit and a control end, and generates light according to a control signal from the control end. The light receiving circuit includes a light receiving unit and a signal reading end, and is configured to receive light to generate a detection signal at the signal reading end. The control unit is configured to generate the control signal and receive the detection signal. The control unit further selectively configures the signal reading end in an input mode or an output mode. Before the control unit configures the signal reading end in the input mode to read the detection signal, the control unit configures the signal reading end in the output mode to pull up a potential of the light receiving unit.

Abstract: There is provided a frame rate adjusting method of a navigation device including: counting a frame period using a clock of a local oscillator of the navigation device; counting a polling period using the same clock; calculating a difference between the frame period and the polling period; adjusting a frame rate of the navigation device when the difference is smaller than a predetermined margin.