In reply to timcook207:
I guess since you are asking about a GPS watch, then you've made up your mind you actually want a watch? If you have one of more advances Polar HRMs, it's possible they support the Wind3 GPS sensor and could display the grid coordinates (not sure, you need to check manual)
I was, however, considering the same problem last year and ended up buying an eTrex20 - it's just so much more useful. Normally, unless you need really exact position, in good weather you can navigate with a map without need for GPS. And then, when the weather gets bad and conditions suck the GPS unit like eTrex can really save ass. If you want, it can only display position and you can make your search on paper map, but I find it pretty cumbersome - it's way faster with the map you can upload to the device. Also, track following is much better than in the simple watch interfaces: you can:
- prepare your track before the trip using your PC
- save your track covered so far, so that it's easy to retrace
- upload someone else's track
- edit your waypoints (springs, bivouac sites etc) in advance
So, I went for such GPS unit and I a really satisfied. Of course, maps cost a lot of money, but there are good Open Map Source alternatives to most european countries (ie: in Spain there are perfect maps for the hills that are free or just for a small donation).
All the above doesn't mean I don't carry a paper map anymore, I do and I can use it, but map reading is a skill you can also practice using handheld GPS and when you really need speed (when conditions are getting bad and dangerous) the GPS with a map display is the way to go imho
Cheers
RS