If the unit is loaded into a zeppelin this will not return the position of the zeppelin but the last position of the unit before it was loaded into the zeppelin.
Since unit extends from widget, you can use widget-related functions too.
See: GetUnitY, BlzGetLocalUnitZ, BlzGetUnitZ, GetWidgetX, GetWidgetY.
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Returns X map coordinate of whichUnit (alive or dead). Returns 0.0 if unit was removed or is null.