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Overview
The navigation system is a highly-sophisticated, hybrid locating system that uses satellites and a map database to show you where you are and to help guide you to a desired destination.
The navigation system receives signals from the global positioning system (GPS), a network of 24 satellites in orbit around the earth. By receiving signals from several of these satellites, the navigation system can determine the latitude, longitude, and elevation of the vehicle. In addition, signals from the system's yaw rate sensor and the PCM (vehicle speed pulse) enable the system to keep track of the vehicle's direction and speed of travel.
This hybrid system has advantages over a system that is either entirely self-contained or one that relies totally on the GPS. For example, the self-contained portion of the system can keep track of vehicle position even when satellite signals cannot be received. When the navigation system is on, the GPS can keep track of the vehicle position even when the vehicle is transported by ferry.
The navigation system applies all location, direction, and speed information to maps and calculates a route to the destination entered. As you drive to that destination, the system provides both visual and audio guidance.
This navigation system also has voice recognition that allows voice control of most of the navigation functions. The Navigation TALK and BACK buttons on the steering wheel activate the voice control. The voice control also allows control of the audio and climate functions.
The illumination signal (headlights ON) is used by the navigation unit to automatically switch the display between Night and Day brightness modes. When the gauge control module brightness control is set to max brightness, the navigation system stays in the day mode, even with the headlights on.
The GA-NET II communication bus passes information back and forth between the display panel control unit, the navigation unit and the audio system. The information passed on this bus is audio settings directed by the navigation unit.
The Comm. Bus connects the HFT, and navigation units. This bus supports these functions:

- The navigation control unit sends a POI phone number (on the Calculate route to screen) to the Hands Free Telephone control unit for dialing.
- The navigation system could download the cellular phone book and call phone numbers in the book.
- The navigation unit can sense the status of a phone that is paired to the HFT.

System Diagram