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Bearing is a direction. The bearings are typically based upon the ship's navigational gyroscope, though if the gyros are not working, the magnetic compass can be used. The ship's course is given as a bearing that is to be steered. Contact information is based on a bearing from the ship. By tracking the bearing of a contact and the range, you can determine the contact's course and speed. Something that is at a 'Constant Bearing' is going to be very close, if not hit, the ship. "CBDR" was something you hated to hear, Constant Bearing Decreasing Range meant that you were going to have to work out course and speed and make recommendations to the Captain as to how to avoid based on Rules of the Road, etc.
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