i also have a lowrance gps fishfinder combo hds series i love it cost was high but had it 5 years with no problem. has a lot of things on it i dont use but it is fun to play with .when i bought mine i went to lowrance .com and downloaded a simulater for my model to my computer got out the owners manual and played with it over the winter. and was ready to go i use mine for fishing waypoints and the fishfinder and use the trails when trolling it is loaded with functions that i dont use