Perth, WA - December 13: Action shot of 49er's rounding a mark, 49er December 13, 2011 off Fremantle, Australia. (Photo by Richard Langdon) ?Perth 2011 ISAF Sailing World Championships, 3rd-18th December 2011.? Perth 2011 image.??For further information please contact richard@oceanimages.co.uk +44 7850 913500 +61 478 221797??© Richard Langdon. Image copyright free for editorial use. This image may not be used for any other purpose without the express prior written permission of Richard Langdon.