Sailing regulations

There are three basic rules for avoiding a collision at sea, but this is a simplification of a detailed set of regulations:

1. A yacht using sails as motive power on port tack^[8] gives way to one on starboard tack.^[9].
2. The more maneuverable vessel gives way to the less maneuverable vessel. It is generally assumed that this means that power 'gives way' to sail, but this is not always the case. It is prudent for a small sailing vessel to stay out of the way of large power driven ships by making an early and obvious alteration in course to signal both recognition of a potential collision situation and that avoiding action has been taken. It is mandatory, by port and harbour regulations, that sailing vessels shall stay clear of shipping in a buoyed channel.
3. If a collision is imminent both vessels must take avoiding action even if one vessel (this is the 'stand-on' vessel) would normally take no action. Not to do so, if there is an opportunity, may make the sailor the guilty party at an inquiry. The use of the term 'right of way' is borrowed from yacht racing environment, does not appear in internationally recognised rules for vessels not racing and is inappropriate to all other vessels and situations.

Power driven vessel A that is on a potential collision course crossing the port side of power driven vessel B must give way. Sailing boats with their sails set on the same side of the boat, require that^[10] the windward boat shall give way to the leeward boat.^[11] Vessel A overtaking vessel B normally must keep clear of them . Head on collisions are avoided by vessels both turning to Starboard.

If these rules are not followed in a yacht race, a protest may be called by one of the skippers. A hearing of protestor and protestee by the protest committee panel will decide who wins the rule breach.

However there are many other rules besides these, that are applicable and sailors are required to know these, which are fundamental boating safety rules including:

• The "rules of the road" or International Regulations for Preventing Collisions at Sea (COLREGS) set forth by the International Maritime Organization are particularly relevant to sailboats because they may be sharing the same body of water as powered vessels, who are bound by the COLREGS.
• The IALA International Association of Lighthouse Authorities standards for lateral marks, lights, signals, and buoyage and rules designed to support safe navigation.
• The SOLAS (Safety of Life at Sea) regulations place the obligations for safety on the owners and operators of any boat including sailboats. These regulations specify the safety equipment needed and emergency procedures to be used appropriate to the boat's size and its sailing range.
• When racing, all sailing vessels must follow the Racing Rules of Sailing promulgated by the International Sailing Federation as well as any prescriptions (additional rules) given by the national governing body and organisation running the event. When a boat that is racing encounters one that is not, the racing boat must comply with the International Regulations for Preventing Collisions at Sea with respect to the non-racing boat. It is the custom amongst sailors that a sailing boat cruising will not normally get in the way of a racing fleet. Similarly, all sailors give way to divers' boats and fishers for reasons of safety & courtesy.

After sunset all boats racing are bound by the International Regulations for Preventing Collisions at Sea (COLREGS) rather than the Racing Rules of Sailing.