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YTB-507 "MIMAC"

Built in 1945 by Commercial Iron Works at Portland, Oregon as the Sassaba-class district harbor tug YTB-507 "Mimac" (hull #239) for the United States Navy.

In 1966, she was redesignated by the United States Navy as the YTM-770 "Mimac."

In 1985, the tug was placed out of service and struck from the Naval Register.

In 1987, she was acquired by the Island Tug and Barge Company of Seattle, Washington. Where the tug was renamed as the Paula S.

In 2012, the tug was acquired by the Northwest Marine Equipment Leasing Company of Anacortes, Washington. At that time she was redocumented as the Ambitious and work began to convert the tug into a fishing tender.

As of 2017, she is laid-up at Lovric's Marine in Anacortes, Washington.


  • Vessel Name: YTB-507 "MIMAC"
  • USCG Doc. No.: 917105
  • Vessel Service: COMMERCIAL FISHING VESSEL
  • Trade Indicator: Fishery
  • Call Sign: WTG5080
  • Hull Material: STEEL
  • Hull Number: 239
  • Ship Builder: COMMERCIAL IRON WORKS
  • Year Built: 1945
  • Length: 94
  • Hailing Port: ANACORTES, WA
  • Hull Depth: 13.3
  • Hull Breadth: 24.9
  • Gross Tonnage: 146
  • Net Tonnage: 99
  • Owner:
    NORTHWEST MARINE EQUIPMENT LEASING CO
    2310 BARON PL
    ANACORTES, WA
  • Previous Vessel Names:
    YTB-507 (Mimac), YTM-770 (Mimac), Paula S
  • Previous Vessel Owners:
    United States Navy, Island Tug and Barge Company