USCGC Champlain was a Lake-class cutter of the United States Coast Guard, launched on 20 June 1928 and commissioned on 23 March 1929.

[1] After 12 years of service with the Coast Guard, she was transferred to the British Royal Navy as part of the Lend-Lease Act.

[2] As part of the Lend-Lease Act she was transferred to the Royal Navy where she was renamed HMS Sennen (Y21) and commissioned on 12 May 1941.

[3] Upon her return to the USCG, her original name was restored and she was given the hull number and designation WPG-319.

She was then placed into reserve status until March 1948 when she was sold to Hughes Brothers, Inc. of New York.