[3][9] Due to its small dimensions and flat bottom, the vessel could only be used in the waters of the Gdańsk Bay in good weather.

[7] During the summer season, when there were no specialized excursion vessels, Castor and Pollux carried official delegations and tourists, mainly to Hel.

[7] From August 1923, both vessels performed towing and piloting tasks, assisting passenger ships and colliers docking at the makeshift pier in the Gdynia port.

[11] After the purchase of a modern and much larger tugboat, Ursus, which took over most towing tasks in the Gdynia port, Castor, which could only operate in good weather, was mainly used for piloting ships, servicing dredgers, and transporting tourists.

[5][15] After undergoing repairs at the Gdańsk Shipyard, the new owner began operating the vessel on the lower and middle Vistula, towing barges on the Gdańsk–Toruń–Włocławek route until the outbreak of the World War II.

[5][16] In the spring of 1940, while working on a road bridge in Toruń during high water levels, the tugboat sank after striking an underwater obstacle.

[5][16] Since the owner of the tug, Edward Grycmacher, refused to sign the Volksliste, the unit was put up for sale and, in July 1940, was acquired by the Gdańsk shipowner Heinrich Gottemeyer.

On 20 November 1946, under the command of skipper Maksymilian Weese, it began its journey to Poland along inland waterways, towing the reclaimed barge Maria, which contained equipment from the Wolbrom Rubber Factory.

[17] From 1950 to 1953, Castor remained idle in the Gdynia port, and during the winter of 1953/1954, it was used as a source of central heating for the ship SS Panna Wodna [pl], anchored on the Motława river in Gdańsk, serving as a restaurant.

The unused unit deteriorated in the port until the owner's death in 1958, when his heirs handed it over to the Regional Scrap Yard, where Castor was cut up.