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Clare County Library

Clare Bluebell Survey

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How to Give a Grid Reference

Ireland is divided into 25 100km squares each of which have been allocated a letter. A grid reference in Clare will begin with Q, R or M. This is followed by 6 digits which are obtained from Ordnance survey maps such as the Discovery Series. The first 3 digits are obtained from the horizontal axis usually given along the top and bottom of a map. And the next 3 digits come from the vertical axis up the side of the map.

For example the grid reference for Drumcliff Round Tower is R328 801.

Discovery Series maps provide instructions on how to give a grid reference. These maps are available in most local libraries in County Clare.