The Gilbert 21 Project
Personal Biological Recording Software
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The Gilbert 21 software is able to select records based on geographic areas. To use this feature the geographic area has to be specified as a 'polygon' (area) in a boundary file. These are just text files with a pair of OS easting and northings (separated by a space) on each line. Each line represents a point on the boundary of the polygon. A number of these files that could be particularly useful for selecting records for export have been prepared for you. You can download these here.

To use any of the files which you can download here, follow this procedure:

Local Record Centre boundaries
Vice County boundaries