Here's the thing.

UTM is just so sweet for land nav. I can tell you to search a 1,000 meter radius of point X and you don't even need to think - just look at your position, measure out a few units, done - you have your radius and that's it, you go north, you go west, you go east, you go south until the GPS numbers say this, and I don't have to be a mathematics whiz to tell you how far to go.

With Lat/Long it's just a PITA.