So between 2 and 4 meters of hight to create windage thanks. Trawlers probably don't worry about windage 1 because they are a
displacement type
boat and 2 because a good portion of the time they have large nets out and
wind won't affect them much since the nets will act somewhat like a
sea anchor. Large
power cats however are something I should take a look at for more info on windage.
Thanks