I installed a Garmin StreetPilot GPS.  I chose this unit because it has a very large, clear dispaly, it has excellent backlighting for use in almost any lighting conditions, and it supports memory cartridges allowing me to carry detail maps for many locations at once.  There is also a color version of this GPS, which I'd like to upgrade to at some point in time.

A primary requirement for my GPS mount was that the GPS must quickly and easily move between the car and the bike.  I considered using the swivel mount included with the StreetPilot, but decided that I was not satisfied that it would stand up to vibration and weather.  The Touratech brackets look fantastic, but it would be a royal pain to remove the GPS from the bike and put it back in the car. 

I found what I feel to be an ideal solution.  The R-A-M ball mounting system is rock-solid, and used for aviation as well as automotive applications. First, I positioned the base on the steering head.  Because of the plastic cap there, I shimmed the base with some folded paper to get it level.  I turned the base around until I was able to get three of the mounting holes lined up with the metal, to get a good solid fit.  Make sure it's far enough back so that it doesn't interfere with the key!  I then used a #7 pilot bit to mark the spot for three holes, removed the bracket, and drilled the holes to about 5/8" depth.  I followed up with a 1/4"x20 tap, cutting threads until the tap bottomed out.

I used stainless steel cap screws, with stainless washers under the topmost screw (as shown to the right).  The washers shim the bracket so that it's level.

I have both a long and short arm for my GPS, so I can mount it in just about any position.  Without a tank bag, I mount it pretty low, so that it doesn't interfere with my view of the "Idiot Lights".  With the tank bag on the bike, I can set it so that it hugs the top of the bag, taking a minimum of space.

Wiring is run from the left handlebar, and makes it's way back to the auxiliary fuse panel in the tail.