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CHAPTER
6
Note:
Make sure the DGPS antenna is mounted on the tallest point of the vehicle and has a clear 360°
view of the sky, and is as far away from sources of magnetic or electrical interference as possible.
Before troubleshooting, attempt to isolate problems into one of the following categories:
•
Receiver
•
Antenna (including cables)
•
Power
•
Transmitting Site
•
Serial Communications (receiver or peripheral device)
Check the Installation
Monitor the effects of the GPS receiver performance as each device on the vehicle is powered on. If the
receiver stops operating properly when a particular device is powered on, that device may be causing magnetic
or electrical interference.
For example, if running the engine causes interference, ignition or alternator noise could be interfering with
GPS signal reception. Try moving the GPS antenna further away from the engine. Test the battery and
alternator for faulty connections or bad equipment.
Receiver
Normally, a minimum of five GPS satellites are required for acceptable receiver accuracy. View the Home
screen on the front panel display and check the number of satellites being tracked. Also, verify the status
indicator for the differential correction state. Refer to Table 1 on page 12 for display descriptions.
Manual No. 016-0171-548 Rev. C
T roubleshooting
C h a p t e r 6
47
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