On Sat, 09 Dec 2006 09:14:25 -0800, Dan Best
wrote:

Could this be the source of your
assertion that most sailors overestimate by 100%?

I believe Roger is talking about the optical illusion that occurs when
the bow of your boat is pointing down into the trough of a good sized
wave but your senses think that the boat is level due to the motion
and G forces.