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GMR 18/24 Marine Radar Installation Instructions
5
Expanded Network
Garmin GMS 10 marine network
port expander
Garmin GDL 30/30A marine
weather/audio satellite
receiver
GA 31
GSD 22 sounder module
to transducer
Garmin
Chartplotter
Garmin
Chartplotter
GMR 18/24 marine radar
GPS 17
NOTE: When using the GMR 18/24 with an expanded network, each network component must be installed according to its installation
instructions. This diagram only shows how a GMR 18/24 radar communicates with an expanded network, and does not show the full wiring needs
of the other network components.
NOTE: The GMR 18/24, Garmin chartplotter, and the other network components must be connected to a power source according to their
installation instructions. This diagram only illustrates the network data connections.
Front of Boat Offset
Depending on the scanner installation, it may be necessary to adjust the Front of Boat Offset. If the scanner installation requires a 180° offset,
change the Front of Boat Offset to 180° and test the radar. If the Front of Boat Offset needs further adjustment, continue with the procedure below.
Using the bow of the ship, take an optical bearing of a stationary target located within viewable range. Measure the target bearing on the radar.
If the bearing deviation is more than +/- 1°, then do the following to access the Front of Boat Offset from the menu on your chartplotter:
Front of Boat Offest on a 3000 Series chartplotter:
1. From the Radar Page, press the ADJ key to display the Adjustment Menu.
2. From the Adjustment Menu, select Setup, and press ENTER. Using the Rocker, select the Advanced tab.
3. Using the ROCKER, highlight the Front of Boat Offset slider, and press ENTER.
4. Adjust the Front of Boat Offset.
Front of Boat Offset on a 4000/5000 Series chartplotter:
1. From the Home screen, select Radar > Radar Setup > Advanced > Front Of Boat.
2. Adjust the Front of Boat Offset.
Using the Radar
All functions of the GMR 18/24 radar are controlled using your Garmin marine network chartplotter. See the Radar section of your
chartplotter's manual for operating instructions. If your chartplotter's manual does not contain a Radar section, download the latest revision of
the manual from http://www.garmin.com/support/userManual.jsp