Forget the lower and mid priced Lowrance units and save yourself a headache. Try and save your money for a Furuno or Raymarine. You won't be sorry you did. There are some good closeouts on the Furuno FCV 620 model if you can live with a 6 inch screen. They released a new model and there are some older ones still being sold, but you might have to act fast. It does not have a GPS, but it is an excellent stand alone FF. I prefer to have a separate GPS unit and prefer stand alone dedicated fish finders. Also. make sure no matter what FF you end up buying get yourself a good Airmar transducer for the unit. The quality of the transducer is just as important as the FF.