Channel Islands grid references
The regular Ordnance Survey Land Ranger and Explorer series of maps do not cover the Channel Islands, and the islands themselves are not covered by the UK national grid. There are, however, several simple methods for tracking down Channel Islands "grid references":
Using a website
Try this page http://www.geograph.org.gg/latlong.php
Enter decimal longitude and latitude and it will give you the grid ref back including C.I. grid refs which all start with WV… Read more