Sail Skills - ColRegs Free Guide to ColRegs (the International Regulations for Preventing Collisions at Sea, the IRPCS or Collision Regs).  Guidance covers all aspects with animations, pictures and diagrams.  Aimed at small vessel users but suitable for professional mariners.  Especially recommended for RYA examination candidates.
Every penny helps!
ColRegs Home>ColRegs>Definitions>Power-Driven Rule 3 (b) Power-Driven Vessel  Any vessel propelled by machinery back to top Power-driven vessel - ferry (Pont-Aven) Small power-driven vessel A sailing vessel is power-driven if she is “propelled by machinery” Sailing yacht propelled by sail (mainsail and genoa) and machinery Small power-driven vessel (the author with his distress purchase dinghy - the other one sank) Sailing yacht propelled by sail (mainsail) and machinery Even if she is mainly propelled by sail However small!
Boating Books