USCS Baltimore was a schooner

Schooner

A schooner is a type of sailing vessel characterized by the use of fore-and-aft sails on two or more masts with the forward mast being no taller than the rear masts....

 that served as a survey ship in the United States Coast Survey from 1851 to 1858.

The Coast Survey acquired Baltimore in 1851 for the use of the hydrographic survey

Hydrographic survey

Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging, offshore oil exploration/drilling and related disciplines. Strong emphasis is placed on soundings, shorelines, tides, currents, sea floor and submerged...

ing party of Richard D. Cutts while it was working on the central California coast. She spent her career operating along the United States West Coast and was retired in 1858.