Watercraft (ie boats & personal watercraft) between 2.5m and 24m in length must conform to the RCD in order to be sold/used in Europe (and a growing list of non-EU countries). The Directive also requires engines & some boat components to be CE marked in their own right, if they are to be fitted to recreational craft.
The new RCD (2013/53/EU) replaced the old RCD (94/25/EC as amended by 2003/44/EC) on 18th January 2017.
Since 1st of January 2010, the International Sailing Federation (ISAF), now World Sailing, has required boats that are to be compliant with their Offshore Special Regulations, to have their scantlings certified. WS themselves issue the certificate but a review of scantlings must be performed by an RCD Notified Body that is specially recognised by WS.
HPi Verification Services is one of the seven bodies that has been recognised.
The PED applies to the design and manufacture (but NOT operation) of pressure equipment with a maximum allowable pressure greater than 0.5 bar (gauge). Any single product or assembly that contains such a pressure falls within the scope & must be CE marked.
Safety Accessories, such as a pressure or temperature switch, that does not contain pressure, also fall within the scope if used to control pressure equipment.