I know my wife bought me a little Garmin nuvi 200 for Xmas (Yea, i'm bad---I peeked!) My question is how do you Garmin users keep it from getting wet on the bike? Obviously I'd take it off in a major downpour, but for the other times. I was thinking about slipping it inside a zip-lock bag--not sure if that would work. I'm interested in your method. Thanks!