(StTug: t. 234 (gr.); l. 113'; b. 25'6"; dr. 7' (mean); s. 12 k.; cpl. 23; a. 2 1‑pdrs.)
The second Mariner, a steam tug, was built at Camden, N.J., in 1906. Following America’s entry into World War I, she was taken over by the Navy and commissioned 1 February 1918, Lt. (jg.) W. C. Coalfleet, USNRF, in command.
Assigned to the Panama Canal Zone, Mariner patrolled the approaches to the canal and provided tug and towing services during the remainder of World War I. She was returned to her owner 13 January 1919 and her name was struck from the Navy list.