A New Hampshire man who sought refuge on an island after his kayak overturned in the Saco River was located early Sunday thanks to a drone equipped with thermal sensors, officials said.

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The drone operated by Center Conway Fire detected a heat source on an island, and the North Conway and Bartlett Fire Swift Water Rescue Team successfully located the man after midnight.

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A drone equipped with thermal sensors led rescuers to a stranded kayaker in New Hampshire's Saco River.

Mark Thompson, 69, of Conway, New Hampshire, was cold and wet but otherwise unharmed, officials said.

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He and his son intended to paddle downstream but both capsized their kayaks Saturday afternoon.

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His son was reunited with his kayak, but Thompson was separated from his kayak and had to swim to safety. He was last seen on shore around 2 p.m., officials said.