Graphic demonstrating Radio Acoustic Ranging (RAR).
Developed in 1923, RAR was the first non-visual navigation system.
Combined velocity of sound in water with radio to obtain fix.
Image ID: theb2242, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Georges Bank
Photo Date: 1931
Credit: NOAA Central Library
Category: Charting/Navigation/Electronic/Radio-Acoustic Ranging/
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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July 7, 2015