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NOAA Photo Library Image - map00129

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.

Image ID: map00129, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Credit: NOAA Central Library Historical Collection

High Resolution Photo Available

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Last Updated:
November 10, 2017