@ Trevally:
I'm doing tests with your grids and emtguf, at 1280x960 (4:3).
The few tests I've done so far have given me very accurate results for distances, but somewhat offset results in the case of the AOB. I hope to be doing it well; I only have done it once or twice before.
For example, with mission "practice_AOB # 1", I get these results for
the HogIsland:
Trevally script - Dist= 1424m - AOB= 56
RAOBF - Dist= 1420mm - AOB= ~ 60
######### EDITED #############
I have miscalculated the AOB. It's my fault. The new measurements are precise.
################################################## ####
I am still doing tests. Truth that this task is very laborious but, fortunately, I have a program that facilitates a bit this work, and I've been using it before to help me when doing missions, but it is still very useful for these tests. For example, to do the trick Makman said about counting pixels, you do not need to count anything if you are using this program.
This is MB-Ruler. It's the best utility for measuring on the screen. It allows you to measure lengths and angles; to make notes; to vary the scale by reference to any object that appears on the screen; to save the image of all these measures; to work with layers, etc. (Excellent for those building missions with MissionEditor).
In the picture below, for example, I am calculating the HogIsland AOB. All annotations, lines and measures you see are being done as I watch the boat through the periscope, in real time, while the boat is moving.
(Ignore the tooltip, the scale was taken for 90º AOB)
This utility is free and can be downloaded from:
http://www.Markus-Bader.de/MB-ruler/index.htm
It's great. Of all I've tried this is the best.
Regarding UZO scales, Makman is right; I think you better don't make them;
You must take a break (at least before TDW change the .cam files again).