And how does that differ from what the crew does automatically? It's also based on measuring two sightings, so if you get the distance wrong the problem persists.
The way I use to make extra sure is having a second opinion. I take the first measurement of the distance, mark it on the map, wait three minutes, do the three-minute rule, then ask the crew. I use an average of both angles / speeds and fire a couple of torps to make really sure.
It only goes the way of the pear when the target changes course (not unlikely in TMaru 1.6 where one out of ten DDs can see at night from miles away) or when torpedoes go dud on me (I hit a kongo with two duds yesterday)
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