|Charles Maginley, The ships of Canada's Marine Services, Vanwell Publishing 2003|
The 110 foot Namao was built in 1975 by the Riverton Boat Works in Manitoba for navigation buoy service on Lake Winnipeg. More here.
Unusual for the prairie location, the Riverton Boat Works built boats for nearly 50 years, including large sophisticated ones like this
The company is still in business as Riverton Welding and Fabricators.