Vincent type sono-radio-buoy being deployed from the GUIDE.RAR operations on north coast of Unimak Island
3/20/2019 12:32:36 PM
Date: 1939
Credit: C&GS; Season's Report Eickelberg 1939-92
Location: North coast of Unimak Island, Aleutian Islands
Subject: Charting
Subject: Navigation
Subject: Electronic
Subject: Radio-Acoustic Ranging