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Answer for the clue "The science of the measurement and description and mapping of the surface waters of the earth with special reference to navigation ", 11 letters:
hydrography

Word definitions for hydrography in dictionaries

Wikipedia Word definitions in Wikipedia
Hydrography is the branch of applied sciences which deals with the measurement and description of the physical features of oceans, seas , coastal areas, lakes and rivers , as well as with the prediction of their change over time, for the primary purpose ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1550s, from hydro- + -graphy . Related: Hydrographic

Wiktionary Word definitions in Wiktionary
n. (context nautical English) The scientific measurement and description of the physical features and conditions of navigable waters and the shoreline.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Hydrography \Hy*drog"ra*phy\, n. [Hydro-, 1 + -graphy: cf. F. hydrographie.] The art of measuring and describing the sea, lakes, rivers, and other waters, with their phenomena. That branch of surveying which embraces the determination of the contour of ...

WordNet Word definitions in WordNet
n. the science of the measurement and description and mapping of the surface waters of the earth with special reference to navigation

Usage examples of hydrography.

He is, as you say, very much your friend and he did throw out some confused remarks about the possibility of a commissionership or even some civilian employment, conceivably to do with hydrography.