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![Hydrographic survey operations - note line from leadline extending ahead theb2102.jpg Hydrographic survey operations - note line from leadline extending ahead](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2102.jpg?itok=63PFO7f2)
Description
Hydrographic survey operations - note line from leadline extending ahead.Two observers shooting angles
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Soundings
Sounding Boats
Keywords
Charting
Soundings
Leadline