Steven Cheshire's British Butterflies Steven Cheshire's British Butterflies

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British Butterflies: Resources: Butterfly Recording: OS Grid Reference Mapping Tool
Drag the red marker on the map to the desired location to display the grid reference or move the map to the approximate location and then click the 'CENTRE MARKER' button to display the grid reference for the center of the map. The grid refs will appear on the right, with corresponding grid squares on the map.

Press the Satellite button to turn on the aerial photos, or Hybrid for both maps and aerials (top right). Use the + and - buttons (top left) to zoom in and out, and the arrows to pan.
Many thanks go to Keith Balmer for sharing the code for this mapping tool originally used on the excellent Bedfordshire Natural History Society web site.

The javascript in this application is released under the GNU General Public License Version 2.