There is nothing wrong with that 50 meter thing. It's just that the length value is rounded up before displaying it. 5.74 km in length becomes 5.7km as value and 5.66km as length becomes 5.7km as value. On average the measurment errors will be displace symmetrically around every full tenth (x.x0 km) If the fractional part would be truncated (5.79km would become 5.70), then it would be wrong! The average of error would be hanging around x.x5 km but you'll see x.x0 as value. Zoom in deep on the map and you'll get a 50m grid and try it out by comparing lengths. And 50 meters more or less isn't going to matter in terms of distances of several kilometers. There are allready 20 parts of 50m in a kilometer. That is 5%, and only get's lower as the distance increases.
Even then 50 meters 'inaccuracy' is nitpicking in practise. (Yes you heard it from me. I'm a champion in nitpicking.) The Watch Officer reporting in 100m is allready pushing it. Especially since rumour has it that most of the targeting was done by gu-estimating.
Archer9 do you mean something like this?:
http://www.subsim.com/radioroom/show...postcount=1308