I think so, it has a solid red box around the ship when I was clicking D. I'll try it again later and see if im doing anything wrong.
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Maybe my control description is too ambiguous... To be explicit, pressing D will enter the "finding destination" state. Then, left-clicking on the map will determine the "destination," while the previously selected unit's location determines the "source." The great circle arc is determined between these two points, and the initial direction is given to the selected unit (it's the initial direction of shortest path on a globe).