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GMR 18 Marine Radar Installation Instructions
Cable Runs
Route the cable as needed, depending on the type of mount you are using. DO NOT cut the cable! It may be necessary to drill a 31.7 mm
(1.25") hole for routing the power/network cable. Garmin provides a rubber cable grommet which may be used to cover the cable installation
hole. The grommet does NOT provide a waterproof seal. To waterproof the grommet, apply a marine sealant. Additional cable grommets can be
purchased through Garmin or a Garmin dealer.
When installing the power/network cable, observe the following:
• To ensure safety, use the appropriate tie-wraps, fasteners, and sealant to secure the cable along a route and through any bulkhead or deck.
Avoid running the cable near moving objects, high-heat sources, or through doorways and bilges.
• Avoid installing the cable next to or parallel to other cables, such as radio antenna lines, or power cables. This is essential to avoid
interference to or from other equipment. If this is not possible, shield the cable with metal conduit or a form of EMI shielding.
• Install the power portion of the cable as close to the battery source as possible. A minimum of 10 VDC is required at the 15 m cable
connector during radar turn-on and operation. See the Wire Gauge Table below for the recommended wire gauge between radar cable and
battery.
Final Wiring Connections
Making the nal wiring connections
1. Connect the Black ground (-) wire to the vessel’s negative power terminal.
2. Connect the Red power (+) wire (with fuse holder) to the vessel’s positive power terminal.
3. For a stand-alone network (MFD and radar only), attach the RJ-45 marine network cable to the RJ-45 socket on the back of the MFD.
For an expanded network (MFD, radar, GMS 10), attach the RJ-45 marine network cable to an open RJ-45 socket on the GMS 10
network power expander. Tighten the RJ-45 locking ring clockwise until it is rmly sealed.
GPS 17
Garmin
MFD
GMR 18 MARINE
RADAR
Stand-alone Network
NOTE: When using the GMR 18 with a stand-alone network, the MFD and GPS antenna (GPS 17) must be installed according to their installation
instructions. This diagram only shows how a GMR 18 radar communicates with a stand-alone network and does not illustrate the full wiring needs
of the MFD or GPS 17.
NOTE: Both the GMR 18 and Garmin MFD must be connected to a power source according to their installation instructions. This diagram only
illustrates the network data connections.