We cross often and generally turn off the radio, take the sunglasses off and answer their questions, we find it is best not to offer unwanted information. Geocaching questions sometimes they will ask what is it all about the same way they do when we go caving. They have even inspected the equipment. Its just their job to ask questions, often strange questions to catch you off guard. After we have been given the OK we have even asked them for directions to locations along the coast and they were very helpful. Have been stopped by the Border Patrol several times when we are close to the border, same thing we just take the time to explain to them and all is good.