Magellan RoadMate 360 Reference Manual page 15

Installation
Route the antenna cable along the weatherstripping of the door and through the
vehicle interior so it such a way that it does not interfere with the operation of
the vehicle.
Plug the end of the external antenna into the socket on the back of the unit.
Replace the unit onto the mount in your vehicle. There is no special settings to
make to the unit in order to use the external antenna. Turn the unit on and
operate normally.
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