The average weight for persons used for commercial vessel stability calculations in Australia is being increased from 75kg to 80kg. This is due to social changes affecting engineering rather than due to a safety margin being added.

A measurement system may/does work well for catamaran classes but they would be more inaccurate for monohulls. More measurement data would certainly be required for a dinghy because hull shape is more influential on dinghies than cats. Also, crew weight is anecdotally a more significant influence on performance for a dinghy than a cat so this would have to be accounted for.