Figures show the Ayrshire-based search and rescue service responded to 344 calls, an increase of 81 on 2006.

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Should calamity strike, you can use the device to send a distress signal to the GEOS International Emergency Response Coordination Center, a search-and-rescue service that will coordinate with local authorities to send help your way.

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But defence analyst Howard Wheeldon said the RAF and Navy had provided a fantastic service over so many years and most search and rescue services around the world remain in the hands of government or military.

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Members of local search and rescue squads are usually happy to render this voluntary service.

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Officers were assisted by the Swaledale Mountain Rescue Team, North Yorkshire Fire and Rescue Service and an RAF air support unit in their search of the water.

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In the meantime, he is working as an RAF search-and-rescue pilot and, with his younger brother, backing charities that support young people, service people and the environment.

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William is a search and rescue pilot for the Royal Air Force and must decide soon if he wants to stay on in the service for another three years.

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