"Wally" wrote in message ...
Jeff Morris wrote:

And I'll go with the sub, also. But what about a lightship?

I would say that a lightship is inconsistent with "On this craft we move at
20-30 knots most of the time." - don't lightships spend most of their time
not moving?

3 asa point for Wally 2

no Lightships has every gone close to 20 knots.

Joe