Carl Aslakson monitoring EPI receiver on HYDROGRAPHER.
Field testing of EPI - first medium frequency survey navigation system.
Invented within the Coast and Geodetic Survey
Image ID: theb2299, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Gulf of Mexico
Photo Date: August, 1948
Credit: Family of Captain George L. Anderson, C&GS
Category: Charting/Navigation/Electronic/HF and MF Systems/
• High Resolution Photo Available