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Originally Posted by Sirkam
Now, i understand it. For example: If i turn ownship to port and the line go up... the active contact is the same direction (port), but, if the line go down, the active contact is in the opposite side (starboard). Is it correct?
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Yes its absolutely correct. On the frigates sonar station, 0 (relative bearing) means the bow of the frigate, 180 means the stern of the frigate. So if you have a contact whose bearing line tends to 0 it means it is closing on the bow of the frigate.
Whereas if its bearing line were increasing towards 180 it would mean it is closing on the stern of the frigate.
By using a manouver (to port or starboard) and those 2 facts above you can infer on which side of the turn the different contacts are.
One thing has to be clear, the frigates sonar station is the only station in DW that uses relative bearings, all other stations (navmap, etc..) and all other sub units (and air units) when using sensors measure absolute (true) bearing.
A relative bearing of 0 always points to the bow of the frigate.
A true bearing of 0 always points to north (in one spefic case relative and absolute bearing coincide but in general they don't).