I see what you are trying to do, but not sure why you need to be that
precise about wind direction and speed relative to the bottom as opposed to
the water. I mean, my boat isn't a weather buoy !
I use the instrument to help in optimizing performance thru the water, and
then use a separate instrument (GPS) for navigating to a point, if
necessary.

"b393capt" wrote in message
oups.com...
I am just about to buy a bunch of Raymaine instruments for my new B
393, and just found out that the ST60 is limited to using SOW, and
won't use GPS SOG & COG, to calculate true wind.

After looking thru this forum, I see some references to this issue, but
don't see either
(1) A way to get true wind on any of the Raymarine instruments, does it
work on the Tri data ??

(2) Another vendor who does not have this limitation mentioned.

Can anyone help me ?