Confirming the same thing David Bows said. He and I both had the same NAVMAN 3100 wind instruments that failed after one year - sending unit died and the displays fogged up. Go TackTick! Since we bought our TackTick T101 wireless wind system, they have introduced a lower cost T033 Wind System with 12V powered display that is still wireless to the sending unit. I know it's pricier than a wired system, but they just work and are easy to install!