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Description
Wiredrag diagram.The basic principle is to drag a wire attached to two vessels.If the wire encounters an obstruction it will come taut and form a V (Image credit: NOAA)
Credit
NOAA
Display Date
1920?
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Soundings
Wiredrag
Keywords
Charting
Soundings
Wiredrag