Just to be on the safe side, I would wait until I'm back at home port. That way, there's no guesswork. You can do as you wish then, without the worry of messing something up.
On your save game, it's a bug from the original, but when you save and exit with a plotted course, the waypoint, and the order to return, or continue the plotted course will lead to engine shutdown.
Go to the Navigator button, and click the button to plot a course. You don't have to add any waypoints, just set the cursor on your last waypoint so it highights, and left click, once or twice, until the OOD answers, following plotted course. Something in the savegame erases the plotted waypoint memory left on the map. So even though the waypoints are still there, the AI doesn't see them, and they need something to reactivate them to follow them.
Saves you the time of having to replot your intended course.
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A legislative act contrary to the Constitution is not law.
-John Marshall Chief Justice of the Supreme Court
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