What size Rocna or Vulcan is suitable for my boat?

Rocna is conservative in their ratings, basing them on 50 knots of wind and associated wave conditions.  On this basis, you can refer to the sizing chart at XXX, which recommends an appropriate size based on the length and displacement of your boat.  If you have a multi-hull, we recommend going up one size from the sizing chart recommendation.  If you have questions, please contact us.