What does the age of the survey mean for nautical charts?
Challenger; the life of a survey ship. Challenger; Hydrographic surveying. THE NEW SHIP are refitted and the surveying officers draw the fair charts from the data collected during the past season.
U.S. Office of Coast Survey
Construction And Maintenance Of Artisanal Fishing Harbours And Village Landings - 2. Making a site survey
Hydrographic survey for std not print
Hydrographic Surveying - Methods, Applications and Uses - The Constructor