For racers this means stripping as much as possible to achieve the highest speed possible. For cruisers, this means "how much can I bring on board without sacrificing safety and performance". If you're cruising, you may have a tendancy to want to bring everything on board times 20 ... "just in case". That can add up quickly!
Because it is so important for the vessel's owners to have accurate information, the European Economic Community (EEC) regulations require a European builder to state both Light displacement AND Max displacement, something that was not required years ago and is not required in some other parts of the world. Here's what that means:
According the ISO 12217 and ISO 866 norms, the light displacement refers to:
- all structural elements
- all the comfort equipment included in the standard version of the boat (as mattresses, cushions, cockpit table),
- the heaviest engines available,
- standard batteries,
- electronics,
- standard deck equipment (ladder, winches, anchors chain and anchor, mast, boom, standard sails, sheets, halyards…).
According to norm ISO 14946, the max loaded displacement refers to the light displacement with in addition:
- the maximum number of persons that the boat can accept (75 kg each),
- all the extra equipment,
- the basic personal equipment,
- provisioning,
- all tanks full (fuel, water and grey tanks),
- Liferaft.
When you compare specifications from a builder, make sure you are comparing apples to apples (or light vs light and max vs max) and that they have the same definition of those terms. =)
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