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1. In the c:geo app, if you click on nearby caches and then the menu button on your phone, you will see a filter option where you can filter out cache sizes, types, difficulties, etc. 2. If your son has an interest in math and numbers he may enjoy solving puzzle caches, so make sure to give them a try. As far as using a compass, i would suggest using a compass along with an aerial photo of the cache location to make make it a little harder than just using a GPS.

P&G- park and grab GC- geocoin NA- needs archive NM- nees maintenance