Wolfstriked - In using the colorful Ujagd stopwatch (or any stopwatch for that matter) to measure speed of the target by timing how long it takes for the target to traverse the scope's bearing line it is important that your speed be low and for you to be somewhat perpendicular to the target's course line. If these conditions aren't met the trigonometry of the calculations breaks down and the results aren't as accurate as they could be.
I think this is the rationale behind the instructions you are recalling from the Ujagd tools.
In fact just about any of these speed or targeting calculations involve solving triangles using trig functions. Your sub is one corner of the triangle, the target's position and distance travelled with time form the other 2 corners. If your sub is moving fast or (especially) changing heading the solutions change rapidly from on moment to the next. Same for the target; once they start zig zagging the solutions get a lot harder to maintain... Longer range makes everything worse !
Thanks for the suggestions...
Terry
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