NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Relative plotting vs Geographical plotting
From: Trevor Kenchington
Date: 2002 Jan 12, 8:50 AM
From: Trevor Kenchington
Date: 2002 Jan 12, 8:50 AM
Brian Whatcott wrote: > One might assume that a person attending a traditional navigation list might > 1) be interested in International rules > 2) be operating a sailing vessel. > > In this case, the windward vessel keeps clear and passing side signals are > not given, rather, a turn to port/starboard indication is provided in > close quarters. The International Collision Regulations, in Part B -- Steering and Sailing Rules, Section II -- Conduct of Vessels in Sight of One Another, require: "Notwithstanding anything contained in the Rules of Part B, Sections I and II, any vessel overtaking any other vessel shall keep out of the way of the vessel being overtaken". [This particular wording is from the Canadian regulations but it is likely identical in meaning to all other national implementations of the international rules.] That provision supersedes the precedence of sail over power, starboard over port, leeward over windward and even of a vessel restricted in her ability to manoeuvre over everything else (though going slowly in front of one of those while it overtakes is NOT recommended). In short, when approaching any vessel from more than two points abaft her beam, you are required to keep clear. There is no requirement for the overtaking vessel to opt for one side or the other of the vessel being overtaken. Trevor Kenchington -- Trevor J. Kenchington PhD Gadus@iStar.ca Gadus Associates, Office(902) 889-9250 R.R.#1, Musquodoboit Harbour, Fax (902) 889-9251 Nova Scotia B0J 2L0, CANADA Home (902) 889-3555 Science Serving the Fisheries http://home.istar.ca/~gadus