been using gps units for years, use it during scouting prior to the season to mark rubs, scrapes, deer trails, etc. first place you need to save it where you started, once you have that you can turn the unit off and head on out, turn it back on where you find something you want to save or leave it on for a backtrack or to save a complete route to your map. the more you use it, the more you will find out what can be done with it. i have several units, some contains topo maps, some do not. i also have a map program called maptech and can download my waypoints or complete routes to the program, save them and upload them again back to the unit. maptech also allows me to print out my own topo maps which i use in conjunction with the unit to locate my exact position on the map. wish you the best of luck with them.