[TG] [TG11] TWS/TWA/TWD not showing on Axiom Pro overlay

[Tom - Raymarine - Moderator]

Hello wdeertz,

There are different 'types' of wind data that can be transmitted within the NMEA2000 Wind Data PGN, 130306:

1. Theoretical Wind (ground referenced, referenced to True North; calculated
   using COG/SOG)
2. Theoretical Wind (ground referenced, referenced to Magnetic North;
   calculated using COG/SOG)
3. Apparent Wind (relative to the vessel centreline)
4. Theoretical (Calculated to Centreline of the vessel, referenced to ground;
   calculated using COG/SOG)
5. Theoretical (Calculated to Centreline of the vessel, referenced to water;
   calculated using Heading/Speed through Water)
   

When Raymarine refers to True Wind, we always mean apparent wind corrected using speed-through-water, never using GPS SOG (when corrected with SOG, we call it Ground Wind.) Raymarine displays calculate True Wind locally using Apparent Wind and STW, so even if a device is transmitting Wind data with the type set to the 5th option above, our displays won't use it. You can display Ground Wind (GWS, GWD) without STW, as long as you have Heading (as opposed to GPS COG), but to display True wind we always require STW.

I have previously put in a feature request for us to display 'Ground Wind Angle' on our displays because although ground wind is of little use for sailing, it would still be useful powerboats. Hopefully this will come in future software. In the meantime though, as long as you have Heading, you should be able to display GWD / GWS.

Regards,
Tom