In my opinion, target speed is the most important factor to precisely get.
You can have a perfect AOB, if your speed is off by 1 or 2 knots you will miss!
If you have a perfect target speed and you have a slightly wrong AOB, you still can hit! (Within 1000/1500m).
Distance is only necessary to get the chrono impact confirmation, and doesn’t influence on your firing solution. 90% of time i let it to default 500m and always hit.
You can determine target speed via the U-Jadg chrono like they did, but best is to be static for a minute to get the precise result. If you are running 2 knots, you’ll have to add few knots to your result via the special chart (depending what GUI you are using).
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