If you are lucky enough to be on the line where the declination is 0°, both are already equivalent, or if you orient your map with your compass (see page 00) then you have made the two equivalent.

To take a bearing by map: Holding the compass flat, point the direction of the travel arrow toward the landmark you have ...

To take a bearing, lay your map flat and orient it to true north using your compass. Then, mark your starting point and ...