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.)