I don't know if it's this way by default, but at least in Trigger Maru the nav map tools can be used while the game is paused. Pause the game, make your plots, resume the game. That will help.
Since I went to manual targeting, I haven't run a boat that didn't have SJ radar on it, so estimating the speed has been very easy for me. Without the radar, I think I'd have to be submerged and use the active sonar to accurately place the ship position.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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