HOLLAND, Mich. (WOOD) — The U.S. Coast Guard said it is searching for a missing fisherman in Lake Michigan, though his boat has been found.

Crews are searching for David Split, 61, who was reported missing around 8 p.m. Tuesday.

He was last seen leaving Spring Lake in a 29-foot Blue Sea Sundancer named A & A. He is known to fish near the mouth of the Grand River and slightly offshore, according to the Coast Guard. The Fuirtport Township Police Department said his cellphone was last pinged around 6 miles off Holland.

The Coast Guard said a helicopter spotted Split’s empty boat about 32 nautical miles west of Grand Haven. There was no sign of Split himself. Crews were still looking for him.

Earlier Wednesday, the Coast Guard said the search area had stretched from Muskegon to around St. Joseph and had covered more than 1,800 square miles.

Boats from the Grand Haven and St. Joseph stations, a helicopter from Traverse City and a C-130 plane out of North Carolina conducted the search overnight, the Coast Guard said. Fresh water and helicopter crews went out Wednesday morning, aided by a C-130 from the Joint Rescue Coordination Center in Trenton, Ontario.

Anyone with information is asked to call Fruitport police at 231.865.8477 or the Coast Guard at 414.747.7182.