Specifications

26 Ray218 and Ray55 Marine VHF Radios
Grounding
While special grounding is not required, it is good marine practice to properly
ground all electronic equipment to the boat’s earth ground system. The Ray218/
Ray55 can be connected to ground by installing the supplied screw and lock
washer into the threaded hole labelled with the icon, located on the
transceiver’s rear panel, adjacent to the antenna jack. Then attach a #10 AWG
wire from this screw to the nearest ship’s earth ground connection point.
CAUTION: Ground Connection
Do not connect this ground connection to the negative terminal of
the battery
.