Meaning Of The Word Ordnance datum

Real Dictionary

What's the definition of Ordnance datum? Find Ordnance datum meanings, definitions and more at the Real Dictionary online.

Ordnance datum Meaning

Ordnance datum Definition
Ordnance datum Definition

What's The Definition Of Ordnance datum?

ordnance datum in British English
noun: mean sea level calculated from observation taken at Newlyn, Cornwall, and used as the official basis for height calculation on British maps

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