When sea kayaker Derek Crook set out to circumnavigate Tasmania earlier this year, the Canadian adventurer knew the dangers involved. Midway through his 36-day expedition, a wave flipped his kayak and left him fighting for his life on an offshore reef. Luckily, Crook was able to grab hold of his kayak and trigger a small, handheld satellite messaging device that transmitted his Global Positioning System coordinates to authorities on the mainland. He was plucked from the water by locals...
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