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Originally Posted by Heibges
I use the MILS method to determine range.
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OK since you brought this up... how many MILS equals one unit on the scope on 1x, 4x and 6x?
As for my methods, i go for eyeballing target speed (taking note of the distance to target, target type and AOB). Quite imprecise but if theres no time for precise calculations, its the way to go. Its best to aim for the middle of the ship in these conditions because if the actual speed is greater or lower than the guessed one, you can still have a chance of hitting fore of aft of the ship.
Second choice, only when time permits is to go PD and listen the engines, counting the RPMs and determining the speed according to some charts. Sometimes works and sometimes doesnt. But its good to get a general ideea of what you may encounter before getting visual.
Third, using the general formula s=d/t. This one depends very much on how accurate you can measure the distance to target and if you identify the target correctlly. Draw a line from your current position to the target on the bearing. Next GUESS the angle on bow (needs practice). Select the angle tool, click anywhere on the previouslly drawn line and extend it all the way to the target and then extend the angle untill you reach a value close to what youve guessed. Careful, at long ranges, 1 or 2 degrees are important. You now have the targets approximate course. Start the stopwatch. Wait one minute and stop. Take another bearing and distance measurement and draw another line. If the distance to target now intersects with the course then you MAY be spot on. If not the you guessed the AOB wrong or measured the distance impreciselly (take 2 or 3 distance measurements always). Next measure the point to point distance along the targets course and apply the formula s=d/t
As a last resort (in my case) i use the stock automatic speed measurement. I find it very imprecise, sometimes beeing off my 2 or 3 knots, althought i measure for 3 minutes and 15 seconds or more.
Cheers!