Yeah, that is pretty much the "Full Manual TDC" I meant. However here is a tip for you.
If you wait exactly 3 minutes and 15 seconds (195 second) between marks, the distance a target covers in hundreds of meters is their speed in knots when multiplied by ten. Example: in 3m15s a ship covers 600 meters (0.6km), their speed is 6 knots. I'd suggest taking two or three such readings as the target closes to make sure the timing is correct.
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