VMG Wind

From: "b393capt" <danielwcorcoran@xxxxxxxxxxx>
Date: 28 Aug 2006 05:48:43 -0700

1) Both my Raymarine ST60 Wind Machine and E-80 Chartplotter have the
ability to display a value "VMG wind". What is this ? Why is it
negative sometimes ?

2) What does the TACK button do on the Wind Machine. Does it simply
make my heading display on the wind-machine ?

.

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