Thanks for the response, what prompted the question is the questions of gps precision and when i asked my brother how he liked his Furuno gps he said it's right on compared to using loran c for years and he wouldn't use another fishfinder, My LS-4100 has too much clutter(6'-8') so haven't been happy with it, do like the walleye pics and the display on the FCV-582L.--shu