Installation manual

Simrad MX500 | 225
other high power transmitters. Review the installation
of the entire system to ensure you have followed proper
procedures for cabling, power, and, most importantly,
grounding and antenna placement. The majority of these
problems will be resolved by better grounding and an-
tenna location selection. Regarding grounding, the water
intake for the engine, or any other electrical ground rely-
ing on the engine or generator for Earth ground, is not
good for the GPS and especially the beacon receiver.
GPS4 - GPS Position Uncertainty
This screen presents a bar graph representing the HDOP
for the past 23 hours. If you are trying to do precision
work or navigation in the same general area (within 100
miles) as the day before, you can look at this screen to
see when the best HDOP periods are. The GPS constella-
tion shifts back 4 minutes per day. That means you can
expect the GPS coverage to be virtually the same today
as it was yesterday.
The small 1 hour gap in the bar graph represents the
24th hour. The gap is provided to ease the readability
of the bar graph for the present time. The dashed line
extending horizontally from the 4 represents the cur-
rent HDOP Limit Alarm, which is set in CFG Position. The
current HDOP and VDOP values are given in the upper
window.
MX Ant. Reset & CSI Reset Tools
Special tools are available in the MX500 CDU that can
be used to reset the GPS and Beacon engines in the MX
antenna. Use them only in extreme cases when the GPS
or beacon receiver fails or takes too long to lock-on. The
“MX Ant Reset” softkey will clear the satellite almanac
memory of the GPS engine and reset all settings of the
antenna to factory default conditions. The “CSI Reset”