I agree the DeLorme Earthmate has a lot of features that I use up here. You can use different SD cards to keep track of other projects with as well. Some of the features if you enjoy fishing can give you some of the depths you are planning on fishing in. There is a lot of options with the Earthmate line of GPS systems.. You can mount it to a boat, atv, or what have you and it can give you the speed your traveling as well.