Sonar man uses bearing. Your boat has a heading.
Bearings are allways relative to your boat - your heading is allways relative to north. Most of the time the skippers wrote the stuff as bearing 234 and heading 234 T (T telling it was relative to True North)
Look for the tool called "360 bearing" it gives you a "compass" that rotates with your boad when you zoom in close enough. Its included in the larger mods RFB and TM(i think).
Good luck
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