Small Vessels operating commercially under the British Flag or in British waters must comply with the Merchant Shipping Regulations or an MCA Code of Practice. There are currently four codes for Small (up to 24m) Vessels.
All vessels, other than those vessels deemed unsuitable for carriage of the booklet by the Certifying Authority (i.e. vessels with no cabin or shelter), are required to carry the relevant copy of the MCA Stability Guidance Booklet (Motor or Sail). Where a booklet is not carried on board a copy is to be made available to crew ashore. These booklets are available free of charge from the MCA or Certifying Authority.