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NOAA Photo Library Image - theb2242

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

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Last Updated:
November 10, 2017