plotting board

plotting board

noun
1.
Navigation. a transparent table on a ship, used as a plotting sheet.
2.
Military. a device based on a map or other scale representation of a region against which artillery fire is to be directed, for use in directing artillery fire against a fixed or moving target.

Origin:
1900–05

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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