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Heading into the West Waterway of the Duwamish earlier that evening, long streaks of red began to light up the screen of the blue depth finder aboard one of Muckleshoot’s fisheries department boats.

The National Marine Manufacturers Association has seen confoundingly mixed results — a fish finder is excluded while a depth finder isn’t, for example.

A fisherman told police his depth finder made him suspect a vehicle was submerged there.

On a recent research trip into Albemarle Sound off Roanoke to collect cores, he pointed to a depth finder that revealed perilously shallow water.

While I was there, I went into a Cabela’s store in Fort Mill, S.C., to buy him a new depth finder for his fishing boat.