Today it got a good workout with the 8-,274 dwt ship Mary as it transited the Narrows. Fleet mate Atlantic Oak was the second tug, and it took up position on the port bow, and does not appear in the photos.
Tucked in astern of the Mary, Spitfire III is ready to work.
Leaning into the line, the tug lists to the point of getting its deck wet.
The tug can exert 100 tonnes or so of braking and turning force to swing the ship's stern.
Spitfire III is lining up the ship to pass under the MacKay bridge.