Ocean current drifter
Detailed Description
Top left, at McNears Beach on San Pablo Bay, a boy discovered a USGS current drifter on March 11, 2007. Top right, Diagram (top and side views) of near-bottom "seabed" drifter used in USGS study of currents in the San Francisco Bay system and adjacent Pacific Ocean. Middle and bottom, near-bottom drifter found at McNears Beach, San Rafael, California, in March 2007.
Sources/Usage
Public Domain.