Bill Kinney, I'm with Craig on this: I understand how VMG optimization works on Wind Navigation.
I fail to see, however, how it might work on mere "W". What would it optimize to, if it does not now where I intend to go to?
Having said that, yesterday afternoon (1st day ever after checking the "VMG Optimization" checkbox), my wife the Admiral was W sailing... plain W-autopilot sailing you see, and the thing did what you described: it actually changed my wife's designated angle, one degree at at time. But we are not clear on what exactly the autopilot thinks it was doing. Surely there is a reason.
At anchor, Thermopylae
---In amelyachtowners@..., <greatketch@...> wrote :
No, "W" wind only mode works fine for the VMG optimization.
I rarely use the "Wind Navigation" mode, and I am not sure exactly how VMG optimization would work there.