Geonav 4C Marine Handheld Chartplotter Navionics Silver CF Charts Built in GPSGEONAV 4C is the first plotter with land maps and marine charts of the whole of Italy and most European countries, at maximum detail, on a single cartridge. NOTE: 3 small dots on the display. Please reffer to the photos. Works with Navionics charts on the CF cards. Equipped with built in GPS device, sunlight visible 3. 5 display and battery charger. GEONAV 4C, from your boat to your car, without even changing the cartridge! The first marine navigator