Just an FYI to the OP:
Those UZO marks mentioned by Pisces did not exist in the real UZO. They are provided in OLCG because IRL it was possible to estimate (quite accurately, and without using any optics) the range to a target which was within firing distance. But estimating range is very hard to do in a monofocal videogame. Is monofocal a word or did I just make it up? Anyway... you will find that the UZO marking lines won't allow you to accurately determine the range of very distant ships, and that's by design, but they're great for getting a firing solution during a night-time surface attack.
