My garmin handheld worked great throughout choko with tons of detail using the garmin maps. I have the 60Csx and the thing is bullet proof and easy to operate even with one hand. Menus are very intuitive and user friendly. Much easier than the ifinder I had. I had the ifinder h20 from Lowrance and with the charts for that one, but the battery hatch is chit and not water proof so it friend my nice 125 dollar map chip. So in the garbage that went. But that also had great maps for the area too.