4
GMR 400/600/1200 xHD Installation Instructions
3. Fasten the radar to the mounting surface using the M10 hex nuts, spring washers, and flat washers in the order shown in Figure 6. The M10
nuts should be torqued to 130 lbf-in (11 lbf-ft) (1.5 kgf-m).
Figure 5
Figure 6
flat washer
spring washer
M10 hex nut
Figure 4
Bow
Stern
Bearing Offset = 0°
Bearing Offset = 180°
Waveguide protective cover
Mounting the Antenna
1. Remove the protective cover from the pedestal wave guide.
2. Verify that the antenna wave guide is aligned with the pedestal wave
guide. Slide the antenna onto the pedestal.
3. Secure the antenna to the pedestal using the 8 mm hex bolts, flat
washers, and spring washers. The 8 mm bolts should be torqued to
70 lbf-in (6 lbf-ft) (.81 kgf-m).
Installing the Voltage Converter Unit
The included voltage converter unit is needed to supply a specific constant voltage to the radar. When installing the voltage converter unit,
consider the following:
• The voltage converter requires an input voltage of 10–40 Vdc (20–40 Vdc for the GMR 1204 and GMR 1206).
• You must connect the converter to the boat battery through a 15 A slow-blow fuse.
• Garmin recommends that you install the voltage converter as close as possible to the selected
power source.
• For optimal performance, connect the voltage converter housing to the RF ground of the vessel.
• If the input wires need to be extended, follow the recommendations in the wire gauge table.
◦ If the wires are extended, use the supplied heat-shrink butt connectors.
◦ After the connector is crimped, heat the connector to shrink it and provide a water resistant fit.
Align the
waveguide faces
Antenna
Pedestal
Wire Gauge Table
Distance
Gauge
9 ft. 10 in. (3 m)
12 AWG
16 ft. 4 in. (5 m)
10 AWG
21 ft. 3 in. (6.5 m)
9 AWG
26 ft. 2 in. (8 m)
8 AWG
