Yep Gutted - its mutiplied with 4.
So if the measurement, like the distance from Deck to top of superstructure on Bismarck is in this image (in real life that height were 27 meters), are 108 mills then the range is:
((the REAL length or height of the object x 1000) / number of mills) x4
eg. from the reading
27 x 1000 / 108 x
4 = 1000 meters