Wherewhendid dual speed on ias come from

(I've always been dumbfounded by the
number of students that have no concept of knots true. Its what matters
if you are actually trying to GET somewhere!).

No, isn't that "knots made good"? After all, wind is an issue. Moreso
for sailing, where the currents and tacking also matter (but I'm not a
sailor so I know not of what I speak, which has never stopped me before!)

Jose
--
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