Understanding the grid reports...
 

Just finnished my first patrol (GWX mod), great fun btw.

Anyway I recieved several messages from other u-boats on their possition and convoy positions they spotted. However either I am just dumb or I don't fully understand the grid and the way it is reported on those messages.

For example, one of the subs reported: 'Convoy in square 1253" And that was it.
Another messages read: "began passage at square AM5137". I understand the AM, where to look for that on the map, but then it is broken down into two digits only, not four. So what am I missing here?

Another message read a reported BB at "BF 1695" Again I didn't understand where exactly. Can anyone help me out, thank you!

Guten Abend, panzermeyer,

Check out this site; I think it's as clear an explanation as you're likely to find:

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

Alles klar? Mach's gut!

testing

Welcome aboard, Panzermayer,

We also use the complete grid system for intelligence purposes, check this out

Visit: http://www.operationspinnennetz.isaf.us/

Ok, I understand it now, thanks.

This shows the brekdown for the last two digits

The sub-sectors are in red

http://uboat.net/maps/images/grid_quad_41.gif