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Antenna connection for GPSMAP system with built-in DGPS
Antenna connection for GPSMAP system without built-in DGPS:
GPSMAP systems without the built-in DGPS beacon receiver do not include
the antenna combiner and antenna coupler. The GPS antenna is connected
directly to the BNC connector on the back of the unit. DGPS capability can be
added, as an option, by purchasing an external beacon receiver—such as
GARMIN’s GBR 21/23.
Connections to an external beacon receiver are made using the NMEA IN,
NMEA OUT (for GBR 21/23 only) and GROUND connections on the supplied
power/data cable. See the beacon receiver owner’s manual for connection
information not covered in the above diagram.
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APPENDIX
Installation
A second 1” x 14 thread antenna mount is needed
when installing a GPSMAP with built-in DGPS
beacon receiver. The second mount is used for the
antenna coupler and whip antenna.
Connect the antenna coupler’s ground strap to a vessel
(earth) ground. An earth ground connection can
usually be made by connecting to a thru-hull fitting,
engine block, dynaplate or body of a metal vehicle.
Note: The GA 23 H-field antenna does not require
grounding.
GPS Antenna
Antenna Combiner
Beacon Antenna
and Coupler
GPSMAP 215/225
(rear view)
BNC Connector
PWR/DATA
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