I have one of these mounted to my Glide via a RAM mount system and powered by the cigarette lighter on the front right lower of the bat wing fairing. It is a great unit but not guaranteed for wet weather. I purchased mine from GPS OZ as a demo model and saved some money, well back then I did as the price of GPS units has really droped from a couple o f years back and they keep getting better and better.
Anyway I highly recommend the Nuvi 765.
Kymbo
Don't mean to crash your post, noticed that you purchased a Garmin Nuvi Model 765 GPS.
I have a Garmin Zumo 660 GPS which I have on my bike, this unit is designed for motorcycle use also car use as well. Noticed that there was mention of the cradle when the device is removed the pins are exposed. Garmin Zumo 660 cradle which is supplied with the unit has a waterproof sealed cover which you clip into the cradle when the unit is removed. Regarding the Zumo 660 being waterproof, I rode in torrential rain for almost 6hrs and the unit kept working with a problem.
Also the Garmin Zumo 660 GPS is smart it knows its mounted on the bike so the menu system is glove friendly making the keys are larger, when in the car the keyboard size is reduced. Just wanted to know why you purchased the Nuvi over the Zumo when you are going to use it on your bike also, just curious.