SMCP - Relative D/F bearings

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No SMCP, na parte que trata de marcações relativas o que significa esse D/F ?

12.1 Relative bearings
Relative bearings can be expressed in degrees relative to the vessel's head. More frequently
this is in relation to the port or starboard bow.
Example: "Buoy 030 degrees on your port bow."
(Relative D/F bearings are more commonly expressed in the 360 degree notation.)

[pdf]

Radiogoniometro:

https://en.wikipedia.org/wiki/Direction_finding

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Obrigado