Well... "possible course interval" could be indicated by drawing a "cone" rapresenting a continguos range of possible courses... until you have a 95% quality solution and you got an etremely narrow cone = a line/arrow.
But I do not know if it will improve the gameplay... Maybe a simple arrow plotted on the contact along the perpendicular of the LOB to just indicate if the bearing is drawing left or right could be useful?
[I think that if you are looking for the kind of feedback on sensor data that you describe in your post then Dangerous Waters comes to mind!]
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