For those that don’t want to invest a lot of money into a new sonar/GPS unit or like me already have decent sonar but no GPS here is a cheaper way out. I purchased a 7” tablet with GPS capabilities and up loaded a lake map app for just over $100.I studied many tablets and came to the conclusion that if it has GPS Glonass or similar then it will work without networks.I haven’t mounted this as of yet and might just keep it in a portable holder, however there are many option available.Besides the cost, another great thing is I don’t have to run wires to make it work!