In terms of manual plotting, my favorite system was in the Sonalyst series. In "Dangerous Waters", the crew will identify and plot target bearing/range/speed but only based on currently available data from sonar/radar/periscope, so the estimate will be grossly off at the beginning, but will be gradually refined as more info is collected.
Your job as captain was to help collect the info and judge how accurate was your crew's target solution.
I had always hoped the SH series would eventually adopt that method rather than the current choice between GPS Auto-plotting or no plotting whatsoever.
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