Navigation rules - page 6

3.6 Rule 3 

The Rule 3(c) - Sailboats under power

The term “sailing vessel” means any vessel under sail provided that propelling machinery, if fitted, is not being used. A Sailboat Under Engine Power is a Power-Driven Vessel. Also note “being used” - your lawyer might argue that “being used” means that the engine was being used to propel. The other side’s lawyer would argue that “being used” was “on”. Assume that if you are a sailboat and your engine is on you are a powerboat.

A Sailboat Under Engine Power is a Power-Driven Vessel

The sailboat must Give Way to the powerboat because (1) The sailboat is now a powerboat and (2) the powerboat is on the starboard side of the sailboat.

The sailboat is the Stand-On vessel because both vessels are considered powerboats and the powerboat is on the port side i.e. the power boat would see a red light on the sailboat and therefore is the giveway vessel. The sailboat would see a green light.