Lowrance electronic Lowrance GlobalMap 3500C - Manual (Page 24)

18
Drill a 1-inch (25.4 mm) hole in the dash for the power and antenna
cables. The best location for this hole is immediately under the gimbal
bracket location. This way, the bracket can be installed so that it covers
the hole, holds the cables in position and results in a neat installation.
Some customers, however, prefer to mount the bracket to the side of the
cable hole — it's a matter of personal preference.