If you want to plot target positions and it's course, but not do those maneuvering board techniques, then I think you are making it really difficult if not impossible for yourself with real navigation mods (hidden uboat icon). You really need to know where your uboat is, as the starting point of the bearing line. If you Ctrl-leftclick on the map then your uboat is moved under the cursor. So that where the line should be starting from. But then you cheat your way around the hidden uboat icon, defeating the mod's purpose.
No uboat icon means you have to resort to relative position plotting from a imaginary point and do some vector magic with the relative motion in the plot and your course and speed.
[edit] the only alternative is to imagine you are somewhere on the map. Start a line representing your course on it. On that line place markers indicating your location based on the speed and time of the plots since the starting location. Then from those markers, place the bearing lines for the sightings. This is known as dead-reckoning plots. But due to the sleepy helmsman in SH3 notoriously unreliable with time compression. After the helmsman reaches the commanded course it just wanders off.
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