USC&GS Marinduque was a steamer, owned by the Philippine Insular Government, that served exclusively in the Philippines. The ship was purchased by the Philippine Bureau of Coast Guard and Transportation to support both government logistical and administrative travel needs as well as the usual functions of a coast guard vessel. The vessel was transferred to the United States Coast and Geodetic Survey serving as a survey ship from 1905 to 1932. Marinduque and Romblon were sister ships, both built in Japan.

The Philippine Coast Guard (PCG) is the third armed uniformed service of the country attached to the Philippines' Department of Transportation, tasked primarily with enforcing laws within Philippine waters, conducting maritime security operations, safeguarding life and property at sea, and protecting marine environment and resources; similar to coast guard units around the world. In case of a declaration of war, the Coast Guard shall also serve as an attached service of the Department of National Defense.