I'm in the middle of reading 'Voyaging the Pacific' by Miles Hordern. It's the tale of a voyage from New Zealand to South America and return in a 28 footer Holman Twister. Good read , by the way. In it he talks about having a dart board set up down below so it appears to be possible. though presumably not in a big blow. :-)
"Said Hamlet to Ophelia, I'll draw a sketch of thee.
What kind of pencil shall I use? 2B or not 2B?” Spike Milligan