OK I'm a boat guy and know my way around navigating by GPS on the water but I'm new to SxS's and trail riding. On my last trip to Ocala NF in Florida I realized pretty quick that a GPS would be handy as many unmarked trails clouded the proper route. What do most ATV guys use on trails in say Tenn, Colorado, Utah - a standalone GPS unit or apps on smart phones? What apps are the best? Sources of digital maps etc?