Back to the original question: If all you need is a basic GPS and you do not need maps and do not ever intend to need maps in the GPS receiver, take a look at the Garmin GPS-72H.

This version of the GPS 72 has the high sensitivity receiver, a 1.6" x 2.2", 4 level gray scale display, takes 2 AA batteries (alkaline, Lithium or NiMH) for 18 hours (alkaline?), is waterproof to IPX7 levels and it floats.

According to the owners manual it allows for 29 different location formats, so I'm fairly certain that UTM is on that list.

This is basically the same GPS that I've seen some pilots take as a back-up nav system. They use a GPS 72 and preload VOR and TACAN stations as fixed waypoints for nav; it allows them to navigate off a tacan reference even though they are below the radar horizon and can't receive the tacan signal.

With all that said, the Foretrex 301 can do most if not all that with 2xAAA batteries but with a smaller display. It doesn't float, but as long as it's strapped to your wrist, it doesn't need to.

The Foretrex 301 is virtually the same price as the GPS 72.

FWIW, $.02??