Jeff, is the android with the Navionics app working off a satelite or is it getting the signal from a tower. I have an I-Phone and the land based GPS operates off tower signals. Is the navionics marine app different???The Navionics app being run on my Verizon Thunderbolt Android pda is great. I use it for quick planning when travelling, as a third back-up on the boat and just general messing around when not on the boat. It's quick, easy and very accurate. It also has a nice radar and tide map overlay that works very well.