I contacted Raymarine support many times, but couldn't get a good answer. So, although I'm still a good Ray's customer, I'd like to share this. Raymarine's wind instrument shows TRUE wind only if you have speed over water information (i.e from the "paddle thing" installed). I refuse to make another hole to get wrong measurement anyway, and argue that TRUE wind could be calculated correctly only using SOG (speed over ground). Raymarine gave me several explanations (foolish ones) and I believe the only reason for that is to PUSH the market to purchase that "paddle thing". In critical situations (downwind with a spi, for instance), the wrong information could lead to wrong decisions and threaten your safety. Have you ever considered that ?