Maybe a forum photo detective can detect if this Laker Amphibian photo
www.seabee.info/teal/thurston.htm shows the airplane beached on a Lake Winnipesaukee sandy beach, shoreline?
A different Laker Amphibian photo down at the bottom of the page from 1968 looks like it could be on Lake Winnipesaukee?
Most likely, Laker Amphibians have a cockpit heater and a windshield defroster, just like a car, something that recreational boats do not have.
Apparently, this small airplane did not come equipped with any windshield wipers?