Would it be cost effective to get an additional fuel door and swap them out?
I can't see it being too difficult to switch them around from one to another if you not using the unit for a period of time.
I wouldn't suggest carrying it with you in the saddle bag....just a thought.
I haven't seen how these hook up in person, but it would seem that it would sure be a PITA to disconnect the gas door, disconnect the wires for the GPS, put on the standard gas door, and then have to redo all of it when you are putting it back on. I have lots of people ask me about the holder for my CB microphone. Everyone wants to know what that is and I rarely have the microphone attached. At least I had it chromed and it doesn't look out of place...but I still get the questions. I would assume that whatever GPS mount you have, you'll get the questions about what that mount is also...whether on your handlebars or on the gas tank lid. In fact, I would imagine that even with the GPS unit mounted, lots of people still ask what the GPS unit is.