Why the wind instuments output MWV and not VMR

[BeMarek]

The 2nd field in MWV should be 'R' for apparent wind , 'T' for true wind. Just tried it sending a MWV to sigK with 'r' then 't', R gets mapped to environment.wind.angleApparent and 'T' to environment.wind.angleTrueWater. 

Thank you for the explanation. The document from nmea.org is very informative.

I've sent an email to Autonnic with similar question and they answered that the sentence is as follows:

$WIMWV,aaa.a,R,ss.s,N,A*hhhhh<CR><LF>

So there is an R here which looks good. Now I just need to cross my fingers that my old good Navico TP200cx will interpret it correctly. In the guide they state:

The TP20 & TP30 also extracts the apparent wind angle from the following NMEA0183 sentences -
VWR Apparent Wind Speed & Angle
MWV Wind Speed & Angle

This resulted me going into initial confusion, but hopefully that will work as expected. BTW, the guy from Autonnic wrote that they could somehow change it in the device to make it talk with VWR if I wished.

Marek