This U.S. Coast & Geodetic Survey disk located on a private Island in the Washington side of the San Juan Islands. This disk is dated 1897 which represents the date it was placed. There are three on this particular Island, and the triangles line up latitude and longitude lines in respect to the triangulation station somewhere in the vicinity.

The U.S. Coast & Geodetic was established in 1807 by Thomas Jefferson to help chart waters for safer navigation. It has since been renamed twice and is now National Oceanic and Atmospheric Administration.

According to a NGS surveyor the disks are named by the area or property owner, dated, and is meant to be read by someone facing North. This one says PLANE 1897 and has a 250 dollar fine for disturbing.