ok I read the RCd or whatever and this is what I could find. thanks for your responses all. Ive got a much better idea now - look at the boat plate and also make sure its def less than 12 and follow the guidlines per boat..
3.6. Manufacturer's maximum recommended load
The manufacturer's maximum recommended load (fuel, water, provisions, miscellaneous equipment and people (in kilograms)) for which the boat was designed shall be determined according to the design category (section 1), stability and freeboard (section 3.2) and buoyancy and flotation (section 3.3).
3.2. Stability and freeboard
The craft shall have sufficient stability and freeboard considering its design category according to section 1 and the manufacturer's maximum recommended load according to section 3.6.
3.3. Buoyancy and flotation
The craft shall be constructed to ensure that it has buoyancy characteristics appropriate to its design category according to section 1.1, and the manufacturer's maximum recommended load according to section 3.6. All habitable multihull craft shall be so designed as to have sufficient buoyancy to remain afloat in the inverted position. Boats of less than six metres in length that are susceptible to swamping when used in their design category shall be provided with appropriate means of flotation in the swamped condition.
2.2. Builder's plate
Each craft shall carry a permanently affixed plate mounted separately from the boat hull identification number, containing the following information:
- manufacturer's name,
- CE marking (see Annex IV),[14]
- boat design category according to section 1,
- manufacturer's maximum recommended load derived from section 3.6 excluding the weight of the contents of the fixed tanks when full,
- number of persons recommended by the manufacturer for which the boat was designed to carry when under way.