Join Date: Sep 2007
Location: Murrells Inlet, SC, USA
First question, what year BMW? From about 05 on they are prewired for connection of a GPS. Just need to get a BMW plug for the GPS end.
Second, resourvoir mounts are questionable. If involved in a mishap, the added leverage on the resourvoir could damage the seal or worse. If that should happen, bike might not work.
On my 05 RT I just mounted next to the clutch res. using the handlebar clamp. Not elegant but more than functional. For power, I had an extra accessory outlet mounted near the tach, facing down. It was wired direct to the battery with fuse, so it was always hot. Personal preference was to keep the GPS alive when I stopped for fuel etc.
GXM 30. This is really a self-contained unit. It is the radio and antenna. RAM makes a mounting bracket which fits neatly behind the Garmin mount. The GXM can be mounted to this bracket with with two screws or using the magnetic base in the GXM. Makes for a very clean install.