Service Mode: GPS

On selecting GPS the following will be displayed:

GPS version information will appear as

• Receiver version
• Receiver software date.

Selecting the functions box allows the selection of,

• GPS version
• GPS status
• GPS tracking info.

Selecting 'GPS status' will display the following information.

• Latitude - displays the current vehicle Latitude
• Longitude - displays the current vehicle Longitude
• Altitude - displays the current vehicle altitude
• Date/time - displays the current date and time
• G-speed/heading - displays the current vehicle speed and heading
• Rec-stat/Pos-Src displays the current receiver status and position source
• COMMERR - this tells us that there is a communication error between the GPS receiver and the navigation computer
• SEARCH - Denotes that the system is searching for satellites
• TRACK - Denotes that the system is tracking satellites but does not have enough information to determine a position. It also shows that the system is functioning correctly
• POS This shows that the system is functioning correctly and is able to fix the position of the vehicle
• PDOP (Position Dilation Of Precision), HDOP (Height Dilation Of Precision) and VDOP (Velocity Dilation Of Precision). These values tells us about the precision of geometric position. One is the best value whereas a value of ten would mean there is no GPS positioning possible.

Selecting 'GPS TRACKING INFO' displays the following information.

• Ch PRN S/N-Displays the satellite being tracked on each channel and their signal strength
• Visible satellites- Displays the number of visible satellites
• Almanac- Displays YES or NO to show whether or not the system is receiving Almanac data.