1. The direction or course of a vehicle or vessel measured in degrees clockwise from true north, as opposed to magnetic north
The pilot adjusted the aircraft to maintain a true heading of 270 degrees.
O piloto ajustou a aeronave para manter um rumo verdadeiro de 270 graus.
2. In navigation, the actual compass bearing relative to the geographic North Pole rather than the magnetic North Pole
The ship's true heading was corrected after accounting for magnetic declination.
O rumo verdadeiro do navio foi corrigido após levar em conta a declinação magnética.