Erecting EPI (Electronic Position Indicator) antenna.EPI was a medium frequency system that was useable out to 200 miles.Invented within the Coast and Geodetic Survey
3/20/2019 10:37:40 AM
Date: 1951
Credit: C&GS; Season's Report Reed 1951-123
Location: Nunivak Island, Bering Sea, Alaska
Subject: Charting
Subject: Navigation
Subject: Electronic
Subject: HF and MF Systems