On December l, 1946 SPAR’s homeport changed to Wood’s Hole, MA. SPAR was moved again on June l, 1957 to Bristol, RI..

In 1957 SPAR conducted oceanographic operations through the Northwest passage. The culmination of this assignment occurred when the Coast Guard Cutters STORIS, BRAMBLE, and SPAR became the first vessels to circumnavigate the North American continent. President Dwight D. Eisenhower sent his personal congratulations for this significant accomplishment. This impressive history was further added to in 1966 when SPAR logged over 17,000 miles and visited such ports as Iceland, Norway, Denmark, Germany, and Ireland while conducting an oceanographic charting expedition in the Northern Atlantic.

The cutter’s homeport changed again in April 1967 to Boston, MA where it and the cutter CACTUS traded captain and crew.

In March 1973 SPAR moved to its last  homeport in South Portland, ME. SPAR went to Refresher Training in Little Creek, VA in 1981 and achieved the highest marks ever earned by an oceangoing buoy tender. In 1983, 1985, 1988, 1990, 1992, and 1995 SPAR again returned from Little Creek with outstanding marks and  proudly displayed a gold "E’ with three gold stripes for nine consecutive overall "Excellent" scores in operations and seamanship training. Because of this, SPAR was  recognized by Vice Admiral Paul Welling, Atlantic Area Commander, as "The cutter with the most gold" in the Atlantic Fleet.

SPAR was a class "C" buoy tender with an overall length of 180 feet, a beam of 37 feet, and a draft of 13 feet. The ship’s hull was constructed of welded steel and has a total displacement of 1025 tons. SPAR was a single screw driven vessel with a bow thruster. It is diesel-electric driven and generated 1200 horsepower for a maximum speed of 12 knots. The ship’s compliment consisted of forty-five enlisted members and eight officers.