Received a GPS for Christmas and it was a duplicate gift. Thinking about putting it on my bike, a cruiser. It is a Garmin Nuvi 255w. Any problem with doing that? I have an electrical wired fitting for a battery maintainer that is wired to the battery. Would I run the power cord to that fitting? Don't know if this unit is waterproof but assume I could cover it with something like the ones used for boating accessories (fish finder, gps, etc). Also, can head set be connected to the unit for tex to voice function?

Thanks in advance for any advice.