Tonci87 has created some amazing tutorials on YouTube. Check out his 4 bearings method while moving video:
I think to be more accurate using this method, it’s important to account for your boat’s movement from the time you get your initial celestial fix and to the time you decelerate to 1.5 kts while submerged. Like accounting for your location during acceleration to get your 4th bearing, I start my stopwatch right away, then take my current speed / 1.5 kts and see how far I traveled, using this average speed, for the time it took to slow to 1.5 kts.
Even though he didn’t account for this, he was still able to sink ships from a range of 4km!
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