my first unit have a defective radio and Garmin swap it out and save my waypoint . suggest you buy ear bud w \/ PTT mic . my hunting party use they and it coordinate we hunt accurately especially send waypoint . bring battery since 6hr seem to be useable time . if money be not a issue buy 530 model since the radio power be 5 watt versus 1\/2 watt and the togel switch be easier to use . overall it make hunting with a group better .