Lowrance LMS 330C Installation And Operation Instructions Manual page 50

Optional R-A-M mounting system.
Bracket Installation
Mount the unit in any convenient location, provided there is clearance
behind the unit when it's tilted for the best viewing angle. You should also
make sure there is enough room behind the unit to attach the power,
transducer and GPS antenna/receiver module cables. (A drawing on the
next page shows the dimensions of a gimbal-mounted unit.)
Holes in the bracket's base allow wood screw or through-bolt mounting.
You may need to place a piece of plywood on the back side of thin fiber-
glass panels to reinforce the panel and secure the mounting hardware.
Front
Install the gimbal bracket. Orient the bracket so the arms slope toward
the front of your unit.
42