A reference card or Romer is a device for increasing the accuracy when reading a grid reference from a map. == Design and use == Made from transparent plastic, paper or other materials, reference cards are found on most baseplate compasses.
A reference card or Romer is a device for increasing the accuracy when reading a grid reference from a map. == Design and use == Made from transparent plastic, paper or other materials, reference cards are found on most baseplate compasses.
Source: Wikipedia "Romer (tool)" · CC BY-SA 4.0
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