188
Version 2.0
Operator’s Manual
Engineering Mode
MX Marine recommends the battery be changed every 2 to 3 years of
operation by an authorized technical dealer. Marine electronics deal-
ers or radio shops will typically stock the replacement battery, Lithium
type CR2032, 3V.
GPS - GPS CDU Troubleshooting
GPS3 - Visible Satellite Information
This screen provides some basic information about the MX421 smart
GPS antenna performance, in that it is basically an extension of
GPS1
screen. It tells you what satellites are available to track at the moment
under the PRN number. The signal strength of satellites under track is
in the second column labeled S/N. The weakest signal strength that
the GPS receiver can track is 25. However, any satellite with a signal
strength under 32 is considered
troubled
, and the GPS receiver will not
use that satellite in the navigation solution. Troubled satellites tend to
cause position jumps and greatly reduce the accuracy of the GPS po-
sition fix.
The
EL
,
AZ
, and
STA
values represent the satellite’s
Elevation
and
Azimuth
, and Almanac
Status
respectively.
Low signal to noise (S/N) quality numbers may be an indication of
local interference from on-board electronic equipment such as Radar,
INMARSAT, VHF, SSB and 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 antenna location selection. Regarding ground-
ing, the water intake for the engine, or any other electrical ground
relying on the engine or generator for Earth ground, is not good for the
GPS and
especially
the beacon receiver.
Summary of Contents for MX420
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