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Originally Posted by donw
Let me jump in here with a question that I'm sure somebody can answer...
When determining speed, it would seem that the ideal orientation would be 90deg AOB from the target.
As this angle increases or decreases, meaning the target is approaching a path either directly away or toward you....how does that effect this method of speed calc?
In other words...if your target is directly ahead of you...going the same direction...how do you get their speed?
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As long as the target isn't heading directly toward/away from you the speed calculation should work. The AOB doesn't really affect the calculation. In other words a ship at 90 AOB will take the same amount of time to cross the line as a ship at 35 AOB.
If the ship is heading directly toward/away from you then you need a different way to determine speed. I would suggest taking a range and bearing reading, then immediately start the chrono. At 3:15 take another range/bearing reading. Then measure the distance between the two points. That distance will be his speed in knots. ie.. 0.7km is 7 knots, 0.9km is 9 knots etc.
You should also think about getting the nomograph mod. It will let you determine speed for any given time value, rather then always waiting exactly 3:15.