[1] Hole was an avid fisherman who contributed to scientific collections so the yacht carried fishing boats as well as 1,000 US gallons (3,800 L) of gasoline for them in special isolated tanks.

After the United States entered the war, the yacht expanded her role to include escorting vessels and convoys as well as carrying local passenger traffic.

[3] Placed back in commission on 19 April 1944 and manned by a Coast Guard crew, Amethyst reported to the Western Sea Frontier section base at Treasure Island, California.

Through the end of 1945, the ship maintained plane guard station, collected weather data, and carried out antisubmarine and antiaircraft coastal patrols.

Purchased in the early 1950s by David P. Hamilton of Shreveport, Louisiana, she served him under the name Pudlo until sold in 1962 to Clarene Y. Martin of Houston, Texas, and renamed Explorer.