Definition
One of the four principal compass directions — north (360°), east (090°), south (180°), or west (270°). A cardinal heading is the aircraft's direction of flight when aligned with one of these four points on the compass.
Plain English
A cardinal heading is when the aircraft is pointed exactly north, east, south, or west — the four main points on the compass.
Context Anchor
Seen in instrument flying when practicing timed turns or turning to a specific heading using the aircraft’s heading instruments.
Derivation
From the Latin cardinalis, meaning 'principal' or 'chief' — from cardo, meaning 'hinge.' The four cardinal directions are the 'hinges' the rest of the compass turns around. This helps explain why north, east, south, and west are treated as the primary reference headings.
Why Pilots Care
Cardinal headings provide simple, evenly spaced targets that make timed turns predictable and easy to calculate without a heading indicator.
Analogy
Think of a compass like a clock face: north, east, south, and west are like the main positions at 12, 3, 6, and 9.
Intuition Check
Cardinal does not mean a bird, a color, or a religious title here. It means “main” or “principal.” Also, heading means the direction the airplane’s nose is pointed, not necessarily the exact path it moves over the ground.
Example Sentence 1
The instructor asked the student to roll out on the next cardinal heading after completing the standard-rate turn.
Example Sentence 2
From a north cardinal heading, a two-minute standard-rate turn reaches the south cardinal heading.