A 58-year-old man spent more than an hour clinging to a mooring buoy in the water near Captree State Park after his kayak overturned Tuesday morning, the Coast Guard said.

Another man, who was fishing, heard cries for help and called 911 about 5 a.m., the Coast Guard said.

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An arriving Coast Guard boat from Station Fire Island was directed toward the man in the water by West Islip firefighters, who could see him from land, the Coast Guard said.

“Thankfully, this man was wearing his lifejacket. It saved his life,” Capt. Andrew Tucci, commanding officer of Coast Guard Sector Long Island Sound, said in a statement.

The man was suffering from mild hypothermia and was to be treated by emergency medical service personnel, the Coast Guard said.