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USS Mary M (SP-3274)
Career (United States) US flag 48 stars.svg
Name: USS Mary M
Namesake: Previous name retained
Completed: 1904
Acquired: 1919
Fate: Sold 1 May 1922
Notes: Operated as civilian motorboat Mary M 1904-1919
General characteristics
Type: Motor launch
Tonnage: 26 gross tons
Length: 64 ft 0 in (19.51 m)
Beam: 12 ft 2 in (3.71 m)
Draft: 4 ft 0 in (1.22 m)
Speed: 10 miles per hour[1]
Armament: None

USS Mary M (SP-3274) was a United States Navy motor launch in commission from 1919 to 1922.

Mary M was built as a civilian motorboat of the same name in 1904 at Sharptown, Maryland. In 1919, the U.S. Navy acquired her from her owner, the J. G. White Engineering Company, and assigned her the section patrol number SP-3274.

Assigned to the 5th Naval District, Mary M served as a launch at Indian Head, Maryland, until sold on 1 May 1922.


  1. The Dictionary of American Naval Fighting Ships at and NavSource Online at give Mary M's speed as 10 miles per hour, implying statute miles per hour, an unusual unit of measure for the speed of a watercraft. It is possible that her speed actually was 10 knots. If 10 statute miles per hour is accurate, the equivalent in knots is 8.7.


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