Garmin GPS 100 - Manual (Page 90)

The GPS 100 comes with a standard slide-in gimbal bracket for fixed
installations. The gimbal bracket may be mounted on a flat surface or
overhead using screws or bolts.
To install the slide mount...
· Place the slide mount into the metal bracket. You may need to pull
both sides of the metal bracket apart slightly to allow room for the slide
mount.
· Secure the assembly with the supplied washers and knobs. Make
certain the teeth of the bracket and slide mount are meshed.
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