1. The actual direction of travel of a vessel or aircraft relative to the Earth's surface, measured clockwise from true north, as opposed to magnetic or compass bearing.
The pilot calculated the true course to be 045 degrees.
O piloto calculou que o rumo verdadeiro era 045 graus.
2. In navigation, the course determined by geographical coordinates without accounting for magnetic variation or compass deviation.
We must adjust our compass heading to match the true course.
Devemos ajustar nosso rumo de bússola para corresponder ao rumo verdadeiro.