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GPS device with compass and altimeter and method for displaying navigation information
| Details |
Inventors: Beason, Lawrence W.; Laverick, David J.; Olivier, Tracy; Burgett, Scott;
Assignee: Garmin Corporation (TW)
Primary Examiner: Beaulieu; Yonel
Assistant Examiner:
Attorney, Agent or Firm: Rolf; Devon A.
A portable, handheld electronic navigation device includes an altimeter, a compass, and a GPS unit. An internal memory stores cartographic data, for displaying the cartographic data on a display of the navigation device. Accordingly, the device is capable of displaying cartographic data surrounding a location of the unit as determined by GPS, heading information as determined by the compass, and altitude information as determined by the altimeter. Additionally, through operation of an input, a user can cause the display to move, and thus display additional cartographic information, in the direction of the compass heading even when the user of the device is standing still. Furthermore, through utilization of a clock, such as the GPS clock, a user can determine altitude changes over time. Also, the altimeter of the navigation may be calibrated with altitude information entered by a user, with altitude information obtained from the cartographic or with altitude information derived from GPS. |
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DETAILED DESCRIPTION It is an object of the present invention to provide an improved navigation unit.
It is an object of the present invention to combine prior art navigation units of various types into a single unit capable of individually or simultaneously displaying navigation information for a variety of types of single display.
It is a further object of the invention to provide unique options for calibrating an altimeter.
These and other objects are achieved by a portable, handheld navigation unit having an internal processor.
Connected to the processor are, at a minimum, an input (such as a keypad), a display, a memory, a tilt sensor, magnetic sensor, a barometric pressure sensor, and a GPS receiver, which also connects to an antenna, such as a GPS patch antenna.
These components, along with a power supply (such as batteries) are housed within a plastic housing sized to be handheld.
As will be understood and appreciated, the input and display are accessible at an exterior of the housing, in a conventional manner.
The navigation device of the present invention serves as a GPS unit, in that GPS signals from a plurality of satellites may be received by the GPS receiver, such that the processor calculates position information based upon the received signals.
Additionally, map information stored in memory may be retrieved and displayed on the display along with the calculated position information.
Additionally, as will be understood and appreciated, the memory may include stored route, forward path, or backward path information, which may be recalled for display on the display.
The conventional use and operation of GPS units is well known, and need not be further described.
Additionally, the navigation device of the present invention serves as an altimeter.
In particular, the barometric pressure sensor measures barometric pressure and provides the sensed barometric pressure information to the processor.
The processor, utilizing stored software, then converts the measured pressure into an altitude, which may be displayed to the user on the display
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Navigation and GPS 
