I've put off replacing the eTrex in my tank bag with something that actually works for as long as possible because I thought I couldn't afford a GPS. But it looks to me like the Garmin nuvi 550 is waterproof, can be inexpensively RAM mounted, has a basic moving map that will get me from A to B, shows actual speed, speed limits, and has points of interest, all of which will be a tremendous improvement. I don't have an audio helmet, so don't even need the voice. Recommendations and feedback, please. The bike is an R100GS.