Abstract: Systems, devices and methods are provided for determining the appropriate or desired geographical correction source for SBAS corrections. One aspect provided herein is a method. According to one method embodiment, a Space Based Augmentation System (SBAS) correction message is received from a selected SBAS satellite. It is determined whether at least one criterion is satisfied for using the selected SBAS satellite as a correction source and then processing the correction message received therefrom. A second SBAS satellite is selected from which to receive SBAS correction messages upon determining that at least one criterion is not satisfied for using the selected SBAS satellite as a correction source. One example of SBAS is the Wide Area Augmentation System (WAAS) used in North America. Other aspects and embodiments are provided herein.

Abstract: A navigation device for navigating a vehicle to a point comprises a GPS receiver for receiving GPS signals, a processor connected with the receiver for processing the GPS signals, navigation data created by the processor, and a display page. The navigation data includes ground speed, altitude, vertical speed and rate of turn information, and the display page presents this information in individual graphic, circular displays representative of an aircraft instrument panel.

Abstract: A navigation device for navigating a vehicle to a point comprises a GPS receiver for receiving GPS signals, a processor connected with the receiver for processing the GPS signals, navigation data created by the processor, and a display page. The navigation data includes ground speed, altitude, vertical speed and rate of turn information, and the display page presents this information in individual graphic, circular displays representative of an aircraft instrument panel.

Abstract: A method and system are provided for minimizing storage and processing of ionospheric grid point corrections transmitted from WAAS satellites in a global positioning system. Based upon a current location, the system creates a boundary around the current location and collects ionospheric grid point corrections within the boundary. The collected correction points are used to correct the position initially determined by a global positioning system.

Abstract: A navigation device for navigating a vehicle to a point comprises a GPS receiver for receiving GPS signals, a processor connected with the receiver for processing the GPS signals, navigation data created by the processor, and a display page. The navigation data includes ground speed, altitude, vertical speed and rate of turn information, and the display page presents this information in individual graphic, circular displays representative of an aircraft instrument panel.

Abstract: A navigation device for navigating a vehicle to a point comprises a GPS receiver for receiving GPS signals, a processor connected with the receiver for processing the GPS signals, navigation data created by the processor, and a display page. The navigation data includes ground speed, altitude, vertical speed and rate of turn information, and the display page presents this information in individual graphic, circular displays representative of an aircraft instrument panel.

Abstract: Systems, devices and methods are provided for determining the appropriate or desired geographical correction source for SBAS corrections. One aspect provided herein is a method. According to one method embodiment, a Space Based Augmentation System (SBAS) correction message is received from a selected SBAS satellite. It is determined whether at least one criterion is satisfied for using the selected SBAS satellite as a correction source and then processing the correction message received therefrom. A second SBAS satellite is selected from which to receive SBAS correction messages upon determining that at least one criterion is not satisfied for using the selected SBAS satellite as a correction source. One example of SBAS is the Wide Area Augmentation System (WAAS) used in North America Other aspects and embodiments are provided herein.

Abstract: A method and system are provided for minimizing storage and processing of ionospheric grid point corrections transmitted from WAAS satellites in a global positioning system. Based upon a current location, the system creates a boundary around the current location and collects ionospheric grid point corrections within the boundary. The collected correction points are used to correct the position initially determined by a global positioning system.

Abstract: A method and system are provided for minimizing storage and processing of ionospheric grid point corrections transmitted from WAAS satellites in a global positioning system. Based upon a current location, the system creates a boundary around the current location and collects ionospheric grid point corrections within the boundary. The collected correction points are used to correct the position initially determined by a global positioning system.

Abstract: A GPS system device acquires satellites after a power-on event without requiring a need for a real time clock. A list of the highest visible satellites for a given periodic interval is computed and referenced by time. The list can be stored in a non-volatile or battery backed memory during a power off state or can be generated at power up prior to satellite acquisition. When the GPS system device is powered on, satellites from the list are searched using a multi-channel correlator until at least one of the satellites is acquired. The present time is estimated based upon the relationship to the list of the satellite, and satellite visibility is computed. The multi-channel correlator is then updated to search satellites that are likely to be visible based upon the acquired satellite. The search for satellites is further refined by the observation of the handover word provided by an acquired satellite. When a minimum number of satellites are acquired, normal satellite tracking and position computation may occur.