"Milton Waddams" wrote in message ...
Which is more accurate to use in estimating leeway, the true
wind/current or the apparent wind/current?


When you estimate leeway you end up plotting it on a chart, don't you?
That should tell you something. On a chart there's no apparent wind
and there's no apparent current. There is only true wind and true
current as it applies to the chart.

If you used apparent wind/current you'd have to extrapolate to true
prior to placing yourself on the chart. So why bother?

Leeway is a function of true wind and current when it comes to plotting
your position on a chart. Apparent is totally meaningless because you
have to ask yourself the burning question: apparent to what? Your ship,
of course. What you feel from the deck of your ship means nothing
as concerns your geographical position (GP)


Wilbur Hubbard