Canonicus (ACM-12) was a Camanche-class auxiliary minelayer in the United States Navy.

Canonicus was originally delivered to the United States Army Coast Artillery Corps, Mine Planter Service in 1942 by Marietta Manufacturing Company of Point Pleasant, West Virginia.

The ship was named USAMP Major General Erasmus Weaver for Erasmus M. Weaver, Jr., the first chief of the National Guard Bureau.

[1] After serving in the Mine Planter Service of the U.S. Army Coast Artillery Corps, it was transferred to the Navy in 1944, classified ACM-12.

[3] After being in reserve with the Navy the ship became a yacht, was converted to diesel, and became the Sandy Hook pilot boat New Jersey.