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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.
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Origin of plotting board

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018