in my younger days I was studying tarchitecture and design drafting... I found that the quarter inch scale of my old engineering ruler worked well at plotting solutions on paper... 1/4 inch = 100 meters. This method of plotting solutions on paper works well for shots between 500 and 2500 meters range. My old 360 degree protractor works well for determining target heading and AOB. Speed is determined by the time elapsed between the first and last observations when compared to the distance the target covered. This method takes between 2 and 4 minutes per shot and with practice I have developed the ability to obtain about an 85%-95% chance of scoring a hit.
My point... If you have the required tools you don't even need a map screen, only a representation of the TDC and the periscope/UZO view.
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