Geocaching is a online Treasure hunt with caches all across the world to get a better understanding go to www.geocaching.com and check it out I have a RAM mount on both my ATVs w/power and when I am out riding I can download the whole trail system where I am riding for example I went to Bend Oregon and downloaded the whole riding area 312 Miles of trails and it would show the Geocaches along the way so I would stop and get them combing 2 sports, the Montana is waterproof and has a very large screen. Sure you can use a car GPS, and put a bag over it, but I'm not into Cheesy, make shift crap. I believe in the right tool for the right job. Also allows you to see where you have ridden, comes in handy for night riding when all the intersections look the same, you can just follow your crumb trail back to your truck.