@ IGD:
I don't like using any other programs with SH4 either. I've plotted on the in-game nav chart and on graph paper. Both will work; it's really a question of personal preference.
The quality of your plot will largely be dependant on range estimation, and the timing of your observations (bearing is self evident). After you have plotted serveral observations, course will be easily seen. One can estimate course from a single observation of Aob, but eyeballing Aob is tricky. I prefer to plot a good number of points, at intervals of at least 3 min. and rely on the plot, instead of trying to judge Aob.
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