Locations were actualy set with 4 digits. They work like a numerical keyboard. with 1, 3, 7 and 9 in corners etc. First you find AL then find 6 (middle right) then divide that square up in 9 fields like the keypad - now find 2 (top middle) devide that place up again in 9 fields - now find 3 (top right) and again for 3. It actualy gets a pretty close location.
As you can see on the krigsmarine karte 1870 G - the square AL62 is about 0,8 x 0,8 degree's (roughly 50x60 miles) - the two aditional digits gives 0,09 degree accuracy for a location or roughly 10 times more precise (5 x 6 miles)
DISCLAMER - above calculations were done using headmath and rough numbers - longitudal and latitudal lenght depends on place on earth.
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