dunno about "just bearing", but
"scope bearing" is the bearing to the target
relative to our position and heading. It is plotted putting our sub at the center of the compass rose and facing N.
"True bearing" is the same, but
unrespective of sub heading. The two are equal when our heading is 00. In any other case you can convert scope bearings into true bearings by subtracting your current heading from scope bearing and viceversa. If for example you are heading E (90°), and scope bearing to target is 45°, the true bearing is 45° - 90° = -45° = 315°.
Notice that the sonarman is always reporting scope bearings that you should convert into true bearing for not getting confused (I don't remember about watchcrew and radar repors though).
As for target courses of BdU contact reports, when they are known, they can be given either as exact compass angles or as extimated compass rose quadrants: i.e. N (348.75° to 11.25°), NNE (11.25° to 33.75°), NE (33.75° to 56.25°), etc. If a remember correctly, there is an option in TDW's UI for switching between the two notations
