From http://www.songofthepaddle.co.uk/forum/showthread.php?t=16298 this looks like a great Tarp – I think it’s from True North, the Big Tarp (see second pic below and http://www.truenorthoutdoor.co.uk/bigtarp.htm ).

These rigs need good pegging ground to work though: camping on sand and pebbles would give a problem, especially in Big Wind. Our solution is to anchor the tarp to the canoe itself (see previous post) requiring only one guy rope out front which could be held in place with a log or rock: the canoe will provide all the stabiity you need from any Big Wind plus if a storm kicks in you simply collapse the tarp down over the canoe ‘Voyageur-style’ and settle in for the night.