Length time width divided by 15 = Rediculous.
I agree with Liam. I am not familiar with the ASA, but if this is a formula they use I have absolutely not respect for their standards. This formula may apply to a barge or a high power tour/scare boat where all seats are lined up like in a movie theatre. On a typical sailboat (If this formula is being applied correctly) it is rediculous. Ex: My boat is 39 X 13 = 507. Divided by 15 = 33.8 people , so we use 33.1 person: stands up in the galley. 1 person: nav station6 people: tightly seated in salon1 person: never leaves the head - now thats a fun trip.5 people: clustered in cockpit1 person on bow hoping he dont get dumped while tacking.6 people on coach roof also hoping not to get dumped while tacking6 people on port rail 6 people stbd railOK thats 33 peopleAll jokes aside, does anyone really consider this safe? Not to mention comfortable.This situation would not be safe for anything more than a 2 hour tour and then the 9 people below would probably also be on the foredeck standing somewhere.And even this would have to be planned and contrived.Just moving about requires people stepping over and around eachother even on the low side.The coordination required for tacking would have to be extremely disciplined. Can it be done? Sure it can.Can it be done safely? I dont think so.IMHOTony B