Abstract: A pocket tide calculator is described which predicts tide times and moon phases in a visual display which gives the semi-diurnal tide times in any given day of the month and can be readily set for the following month. This device automatically leaves out the high or low tide which is alternately missing every 7.5 days. This invention incorporates a compressed time scale when compared with a normal 24-hour clock face which enables a concise display of the semi-diurnal tide cycle.

Abstract: A directional plotter for underwater searches, land searches, land orienting, or the like includes a pair of first and second relatively rotatable discs with the first disc including first, second and third concentric sets of compass degrees in radially adjacent relationship to each other. The second disc includes first, second and third sets of apertures associated with the first, second and third concentric sets of compass degrees. The two discs are relatively rotatable such that different search patterns can be established by rotating the discs relative to each other and viewing the required degrees for a particular search pattern through the associated apertures.

Abstract: A device for rapidly obtaining data related to destination points in the form of a navigational chart that supports a slide to move in a defined path relative to and beneath the display. A window is provided in the chart or along an edge thereof to enable a pointer on the slide to be visible through the useful range of movement of the slide. On the slide is provided at least one column of data, the individual lines of data being viewed sequentially through another window through the chart. Destination points are displayed on the navigational chart in their appropriate analog positions and connected by lines to the edge of the slot along which the pointer moves. The data is so coordinated with the pointer than when the point is opposite a line connected to a desired destination point, the proper data such as latitude and longitude and time delay codes for that destination point appear in the window as required in Loran and Global Position Satellite (GPS) systems.

Abstract: A demonstrative teaching apparatus for teaching the relationship between variable pictorial and/or graphic displays and their respective numerical values, in which the entire apparatus is positioned within an apparatus housing. The apparatus housing incorporates viewing areas on its front and rear sides so as to provide optical display of the relevant teaching portions of the apparatus. The front viewing area reveals the position of the segmented display while the rear viewing area reveals numerical indicia corresponding to the display of segments appearing through the first viewing area. The segmented display and, in turn, its respective numerical indicia, can be increased or decreased by forward or reverse rotation of a circular disk. The circular disk is precluded from excessive rotation in either direction through stopping mechanisms which limit the inadvertent winding or unwinding of the segmented display.

Abstract: This invention provides an inexpensive but accurate mechanical analog computer device for providing information based on the relative positions of two or more indicia bearing members at least one of which is mounted to another of said members for non-rotational orbital movement. More particularly a preferred embodiment of the invention is directed to a visual-mechanical device which simulates ADF and/or VOR navigation such that students and experienced pilots can develop skills at home, and also use the device as a reference tool in actual flight. The device incorporates a disc assembly which revolves or orbits non-rotationally about a beacon representation, driven by a lever which also rotates about the Beacon. The discs and lever have representations of the dials, pointers and windows necessary for unambiguous simulation of ADF and/or VOR navigation without interchange of parts.

Abstract: A navigational calculator (10) for establishing the ratios of time, or distance, to be spent on port or starboard tacks, respectively, during the maneuvering of a yacht to a windward destination. A plurality of disk members are carried on a central support (11). The first disk member (14) has a true wind indicator (30) imprinted thereon. The second disk member (15) has a compass rose (34) imprinted thereon. The third disk member (16) has a course indicator (35) and two sets (38 and 39) of tack ratio indicia imprinted thereon. The fourth and fifth disk members (18 and 19) have starboard and port heading indicators (46 and 55, respectively) imprinted thereon. The sixth disk member (20) has included tacking angle indicia imprinted thereon and a tack ratio indicator (61) alignable with one set (38) tack ratio indicia. The seventh disk member (21) has included tacking angle indicia imprinted thereon and a tack ratio indicator (66) alignable with the other set ( 39) of tack ratio indicia.

Abstract: There is disclosed a marine calculator of the slide rule type whereby the running distance to a destination station over a dogleg or zig zag course may be readily determined from knowledge of the rhumb line course distance and the departure angle of the dogleg or zig zag course.

Abstract: A wind and course calculator for navigation is provided comprising two superimposed disks made from a transparent material, a mobile disk 1 movable in rotation and in translation carrying a network of concentric circles corresponding to the speeds and of converging straight lines corresponding to the angular values of headings and a supporting disk 2 having a mark 5 indicating the heading and, at its periphery, graduations corresponding to the angular values of sailing trims of the boat and a scale of speeds 7 carried on the radius directed towards the indication of the heading, on the reverse side of which supporting disk is fixed a pointer 10, 11 having a slider 12 carrying a reference dot 13 serving as display and reading point. The upper face of the supporting disk has two parallel guides 3 between which the mobile disk 1 slides.

Abstract: A course and heading computer for use with marine charts which includes a transparent planar baseplate having a semicircular edge at one end joined with rectangular edges at the opposite end, the straightedge parallel to the shorter dimension of the baseplate being equal in length to the diameter of the semicircle, a 360.degree. circular scale imprinted on the baseplate with its center at the center of the semicircle, and a printed scaled grid to assure quick, accurate alignment, on the marine charts, and a transparent disk member rotatably attached at its center to the center of said semicircle, and having a 360.degree.

Abstract: A slide rule for solving time/speed/distance problems where distances are measured with a single or universal ruler applicable to all charts or maps regardless of scale. Result is achieved by printing alongside time entries on the slide rule a row of appropriately-spaced numbers constituting indicia of chart or map scale, and which has a range encompassing the largest and smallest scales of charts or maps which are likely to be encountered. When such numbers are properly positioned, it is necessary only to set chart scale opposite speed made good, after which running time will always appear opposite distance travelled, and vice versa. This device eliminates the need to use dividers and mileage or latitude scale, and thus obviates the intermediate steps which their use entails.

Abstract: The purpose of this invention is to provide an improved structure for a flight computer used by aircraft pilots. This improved computer structure is constructed of sheets of material fastened together in laminer fashion the outer surfaces containing formulas, graphs, etc. and the front side containing a rotating disk and cursor to aid in the solution of wind problems, and course plotting.

Abstract: Yacht racing is becoming more scientific and to assist a skipper in quantifying the shortest course to sail to take advantage of wind direction, a tactical aid is provided. The aid is a device for use in connection with information read from a compass mounted on the yacht.The device comprises a set of interacting members each carrying information concerning a yacht's tactical position to enable the skipper to determine whether or not his course is advantageous or not.

Abstract: A manually operable calculator for optimizing aircraft fuel consumption during descent from an actual altitude to a target altitude/distance. Altitude and distance scales are provided which are alignable to determine an uncorrected fuel efficient distance to commence a descent from a given altitude to a target location, with separate scales being provided for different airspeeds. Wind and weight correction scales are also provided which give a distance correction based upon the aircraft's weight, prevailing wind conditions, and the difference between beginning and target altitudes. In the preferred embodiment a plurality of altitude scales are employed, each scale having thereon an altitude display which is proportioned in accordance with a respective air speed and given in terms of mach speed for altitudes above a mach speed/I.A.S. transition point, and in terms of I.A.S. below that point. In this embodiment a single, linear distance scale is employed.

Abstract: A tidal time indicator for determining tide times at various locations on a specific stretch of coastline comprises a pair of complementary charts. One of the charts is in the form of a map having index marks representing the various locations and which marks are spaced apart at distances corresponding to the known tidal time differences between the particular locations. The other chart is in the form of a rule having a time scale and index marks representing different days, each of these index marks being positioned relative to the time scale at the high or low tide time on the particular day for a reference location on the map chart. Thus, by positioning the rule chart relative to the map chart so as to register a date mark with an index mark on the map chart representing the reference location, the tide times at the other map locations can be read directly off the time scale adjacent their respective index marks on the map. To prepare the charts, information is obtained from Tide Tables.

Abstract: A circular disk type calculator for determining the proper approach speed for a particular aircraft within a specified range of gross weights and flap settings. The calculator includes three superposed circular disks pivoted for independent rotation about their centers. A third lower disk is imprinted with appropriate speed and weight information. A second intermediate disk includes cut-outs and windows to expose certain readings on the lower disk and also includes a flap setting marker extending outwardly from its outer edge. A first upper disk is provided with appropriate windows and markings relating to the other disks thereby indicating the desired information including pattern and threshold air speed for the gross weight and flap setting of the aircraft.

Abstract: A street address locating aid includes two printed paper discs. Street addresses and cross streets are printed in concentric circles on both sides of each disc. A printed paper carrier having first and second essentially parallel sheets is mounted on opposite sides of the two discs. Each of the two sheets of the carrier include "street address" and "location near" apertures through which a particular street address and the corresponding cross street are exposed. By rotating the discs, different street addresses can be selected and the cross street near that address is displayed. The two discs are mounted so that they are partially overlapping within the carrier but so that neither disc obstructs the view of the street address and location near apertures associated with the other disc.

Abstract: A device utilizing three discs, which are rotatably positionable relative to each other, is provided for computing aerial navigation wind correction angle and ground speed correction for various combinations of aircraft True Course, Wind Direction, Wind Velocity, and True Air Speed. The first disc, which for most effective utilization of the device is referenced to the longitudinal axis of an aircraft outline, has a first series of informational whole number scales running circularly therearound indicating wind correction angles for various wind velocities, and a second circularly arranged series of whole number scales indicating ground speed corrections for various wind velocities. The second of these discs provides a compass rose around its circumference which is positioned in accordance with the aircraft true course set at the longitudinal axis of the aircraft outline of the first disc, and upon which the third disc is positioned in accordance with the wind direction.

Abstract: A time and tide calculating device for wrist watches clocks and calculators that register the tides and the time of the tides, comprising rotatable concentric tide and calendar discs placed adjacent to a clock face for indicative registration and cooperation with time telling devices, having various arrangements of said tide and calendar discs showing tide positions and the calendar date in registration with clock and watch faces that also include digital information on day, date and the AM or PM by the development of new clock works to rotate such information required for telling the date, the time, the AM or PM, the tide and a reference on said calendar disc responsive to showing the state of the tides in advance for the following days of a calendar.

Abstract: An aircraft descent calculator including a central member defining an outer annular dial face about the periphery thereof; an intermediate member defining an intermediate annular dial face about the periphery thereof rotatably mounted on the central member so that the intermediate dial face lies adjacent the inside of said outer dial face; and an inner member defining an inner annular dial face about the periphery thereof rotatably mounted on the intermediate member in juxtaposition with said intermediate dial face where each of the dial faces divided into equal angular spaces, where the intermediate dial face has aircraft altitude indicia recorded thereon increasing in prescribed altitude increments in a first direction around the intermediate dial face and where both the inner and outer dial faces have aircraft DME distance recorded thereon increasing in prescribed distance increments in opposite directions around the dial faces so that said dial faces can be manipulated to determine positions on a prescrib

Abstract: A time and tide calculating device for wrist watches clocks and calculators that register the tides and the time of the tides, comprising rotatable concentric tide and calendar discs placed adjacent to a clock face for indicative registration and cooperation with time telling devices, having various arrangements of said tide and calendar discs showing tide positions and the calendar date in registration with clock and watch faces that also include digital information on day, date and the AM or PM by the development of new clock works to rotate such information required for telling the date, the time, the AM or PM, the tide and a reference on said calendar disc responsive to showing the state of the tides in advance for the following days of a calendar.

Abstract: A course correction calculator for use in light aircraft includes two arms pivotally connected together and each independently pivoted over a map supported on a base. The pivot connecting the two arms is slidable longitudinally along one of the arms and the other of the arms is slidable longitudinally relative to one of two pivot points. A protractor is provided at the pivot connecting the two arms to indicate the angle between them and hence course correction when the two independent pivots are at the departure and destination points on the map and the mutual pivot is at the aircraft's position on the map.