Nice idea Wilcke about the real chronometer, I might go and get one as the annoying thing for me is the chronometer disappearing when I switch views.
Slick, you can pause time and still plot things on the nav map. That should give you all the time you need. Or, you can do what some skippers did at sea - stop and make it easy.
If you want to sail about and don't want to do a plot relative to your own sub, and keep moving about on the map, you can just pick a spot on the map and do a relative plot there. You'll need to mark the start of your own sub's position when you take your first reading and an end mark when you are ready to get the target's actual track. This way you will end up with two vectors, one is your own sub's movement and the other is the targets relative movement to your sub. You can then add the two vectors together to get the targets plot, but I really wouldn't recommend doing it this way! It's much easier to pause time and plot directly against your own position.
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