had the SE for about a week now still learning the machine great machine. sometimes it will give a false signal I will go back to the signal and nothing is there this common? mostly down by the water and by the motel walls I guess this is because of all the iron in the walls.is there a setup to take all the iron out of the equation ? and is there a better setup other than factory setup for beach and down by the water??????????? dug a square coffee can lid three feet down on beach today would not of believed it if I didn't dig it [unbelievable]