Most of us can get by with occasionally frequently checking our rear view mirror, but many bigger vehicles don't offer quite the same visibility. Hence the market for bumper cams in general and for Magellan's new Wireless Back-Up Camera in particular. The $150 add-on exploits the 7-inch LCD on your RoadMate 1700 or 9055, thereby avoiding the clutter of an independent system. The waterproof and dustproof camera fixes to your license plate and connects to a transmitter in your trunk, which then beams the feed to a receiver attached to your GPS. The syste
