What data do I need to get True Wind with my Raymarine system?

[Chuck - Raymarine - Moderator]

Dave,

This subject has been addressed many times before within this and other forums. It is not possible to do as you have suggested, as it would cause the reference frame for True Wind (sometimes called True Relative to Boat) to be changed from the boat's reference frame to the ground reference frame. Per Raymarine and other high performance manufacturers of racing instruments (see the article referenced within the prior response, True Wind requires speed through water and heading data.