NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Sable Island, was: Da Lurk
From: Trevor Kenchington
Date: 2003 Feb 10, 09:48 -0400
From: Trevor Kenchington
Date: 2003 Feb 10, 09:48 -0400
Fred Hebard wrote: > There was a link to a picture posted here not long ago about a boat > fetched up on an island off Canada due to the great circle/rhumb line > referred to in other posts here. Exactly what caused that yacht to be where she was seems a bit unclear, except that gross incompetence must have been involved. Sable Island and the shallow bars extending from each end represent an "obstruction to sea room" (as the IYRU racing rules used to put it) some 50 miles in length -- an obstruction which has been well known to mariners voyaging in the northwest Atlantic for the better part of 500 years. Since the island lies very close to the Great Circle route from Nantucket Shoals to the English Channel, it is hardly an obscure feature, tucked well out of the way. It isn't so difficult to make a landing on North Beach of Sable, if you pick your weather. There is even something of an anchorage there, albeit in an open roadstead, with a degree of shelter from any wind with some southerly component. However, the yacht in question went ashore on South Beach and nobody has any business getting any kind of vessel close inshore there -- save for the old rescue lifeboats which were sent out from the beach, in days before helicopters, to take off the unfortunate crews of ships that did run too close in. South Beach faces the open Atlantic, without even much of the continental shelf outside it to sap energy from the largest waves. It has a series of shallow bars beyond the tideline, on which the ocean swells break continuously, even when the wind is in the north. A fine playground for the seals, which are plentiful, but no place for yacht or ship. Whether it was a confusion of Great Circle with rhumb line or simply a blindness to features clearly shown on the chart, getting anywhere near that beach was a major blunder. 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