I'm a noob here, mainly hunting for good tips/reviews, thoughts, etc for my week old Montana 600. I'm mainly using it on my motorcycle and for hiking. So far, I haven't done much geocaching.
In any case, I just saw this question, and thought I'd respond.
One of the first things I did was attach the carabiner from my old Oregon to my new toy, using an old nylon strap. It works just fine, doesn't swing much more than the Oregon did. I've already been on a few hikes with it, and excess swinging hasn't been a problem at all. Here's a pic:
DSC08481 (Custom) by skagitstan, on Flickr