Lowrance electronic GlobalMap 3300C - Manual (Page 29)

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Drill a 1-inch (25.4 mm) hole in the dash for the power, transducer 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 in-
stallation. Some customers, however, prefer to mount the bracket to the
side of the cable hole — it's a matter of personal preference.
Front view (left) and side view (right) showing dimensions of Global-
Map 3300C GPS unit when mounted on gimbal bracket.
After drilling the hole, pass the transducer connector up through the
hole from under the dash, followed by antenna connector. Pass the
power cable's bare-wire end down though the hole from the top.
If you wish, you can fill in the hole around the cables with a good ma-
rine caulking compound. (Some marine dealers stock cable hole covers
to conceal the opening.) No matter what type of installation you prefer,
be sure to leave enough slack in the cables to allow tilting or swiveling
the unit. If you choose to fill in the hole, be sure to position the cables
against the rear edge of the hole as you apply the fill material.
Before positioning the bracket, be sure to hold the cables against the
rear edge of the hole. Then, slide the bracket over the hole and butt the
rear of the bracket base firmly against the cables, thus pinning them in
Millimeter
[Inch]
27.6
[1.09]
77.1
[3.03]
137.9
[5.43]
56.9
[2.24]
157.9
[6.22]
173.9
[6.85]