I believe that most "boaters", sail or power, would understand VMG to refer to Velocity Made Good to the next waypoint if a Route
is "active", since that is where the route
is trying to take you. Whether you are steering
with OCPN driving it, windvane steering
, or a person on the tiller tacking to windward, if a waypoint is being used, that is where you are trying to go.
If there is no active waypoint, the VMG is obvioulsy not referencing a geographic location. In ths case VMG as used above has no meaning.
Speed towards the true wind
, on any sailboat heavier that an O'Pen BIC, is meaningless since a change in direction gives an instantaneous change in this value without any change in boat speed, especially on somethig like my Alberg
37. It's only value is in long term plotting of your polar diagram.
I suggest that you come up with some term for this value that is totally different, that cannot be confused with VMG as used above. (Such as RST "Real Speed to True Wind"