Hmm, the 305 won't give you a grid coordinates, but you might be able to do it indirectly by storing a path in it that goes to the grid location. Bit of a faff though.
Thanks for the advice. It worked! Took my daughter out, and we found 2/4 caches. Garmin worked great once I worked out what I was looking at! And It got small person away from the Xbox for a change, treasure hunting is soooo much more exciting than just "going for a walk with Mum". We're hooked!
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You can with the 405, I've done it.
You can enter a location, and the compass arrow will point the way, I thought the 305 had the same functionality......