In aeronautical navigation, what is the consequence of not factoring in magnetic deviation during flight?

In aeronautical navigation, failing to account for magnetic deviation can result in significant navigation errors. Magnetic deviation occurs due to interference from the aircraft's own magnetic field, caused by instruments, electrical systems, or other onboard ferrous materials.

If a pilot does not adjust for this deviation, they may follow an incorrect magnetic heading, leading to miscalculations in their intended flight path. This could cause the aircraft to veer off course, resulting in navigation errors that can have serious implications, including increased flight time, fuel consumption, or even entering restricted airspace unintentionally.

Considering magnetic deviation is crucial to ensure that pilots can accurately navigate from one point to another, maintaining safety and operational efficiency during the flight.