Winds were below 1 knot and we were making headway.

I'm curious, how do you measure that? The various annemometers I have
stop
turning at speeds that low. Even smoke rising from a cigarette is close
to
vertical when you go much below a knot.

Well, one could pee in the water and then watch the bubbles. I just watched
the water moving past the rudder and the sediment in the water moving from
the bow to the stern. How would you detect movement? We also had a GPS that
was leaving tracks. Another thing, we ended up at a different location, so I
believe that would indicate some movement was involved. You act like 1 knot
is almost stationary and smoke would go straight up, but think about it.
That is moving at a rate 5,280 in just one hour, or 1.47' per second. It is
easy to detect movement and using a GPS to measure distance and the amount
of time required to cover that distance. Anyway, I did not do all that, I
just made an observation and said the wind speed is about 1 knot or less, no
measuring device needed. Give me a break.