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Inbred Pest · 08-21-06, 04:19 AM

The 'double reference' 4 digit grid numbers you refer to are rather simple to figure out. Each grid was further broken down into 9 smaller grids, and each of these smaller grids was again broken down into 9 subgrids. For example, BE5819 would be grid BE58. The 1 indicates the subgrid in the northwest corner, and the 9 indicates the southwest corner of the 1 subgrid.

It is better explained in pictures here:

http://uboat.net/maps/grid.html

As for Lat/Long to and from grid squares, you can convert them here:

http://www.ubootwaffe.net/quadrant.cgi

Happy Hunting.

08-21-06, 04:19 AM	#5
Inbred Pest Swabbie Join Date: Jul 2006 Location: Pennsylvania, USA Posts: 6 Downloads: 0 Uploads: 0	The 'double reference' 4 digit grid numbers you refer to are rather simple to figure out. Each grid was further broken down into 9 smaller grids, and each of these smaller grids was again broken down into 9 subgrids. For example, BE5819 would be grid BE58. The 1 indicates the subgrid in the northwest corner, and the 9 indicates the southwest corner of the 1 subgrid. It is better explained in pictures here: http://uboat.net/maps/grid.html As for Lat/Long to and from grid squares, you can convert them here: http://www.ubootwaffe.net/quadrant.cgi Happy Hunting.