The discovery survey of Astoria Canyon off the Oregon coast

The discovery survey of Astoria Canyon off the Oregon coast. The lines of dots are lines of soundings navigated by means of radio-acoustic ranging, the first precision navigation system to eliminate the need for visual signals. This system was developed by the C&GS in the 1920’s and used until WWII. Many discoveries were made because of it.

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Author: NOAA Central Library Historical Collection/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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Added On	18th October 2015
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