Fill what you know from your source. Blank fields are fine — never guess a number. Everything goes to a moderation queue where a moderator checks it against the sources you cite before it enters the official database.
Boat identity
Which MODEL is this? The wiki catalogues models, not individual boats — use the exact spelling from your source.
Leave blank if there is only one version.
Dimensions
All in metres. Leave anything you don't know blank — never guess.
Width of ONE hull, not both together
Height of the deck between the hulls above the water
Weights & sail
Metric: kg, m², kW. "Light" = empty boat (no crew, no cargo).
Systems & interior
Optional — leave unknowns blank.
All engines combined — e.g. two 30 kW engines = 60
Sources & you
Every number needs a source. This is what makes the database trustworthy.