How can errors in magnetic variation impact aviation navigation?

Errors in magnetic variation can lead to navigation inaccuracies because magnetic variation, or declination, is the angle difference between true north and magnetic north. Pilots primarily use magnetic compasses and other navigation instruments that rely on magnetic references. If a pilot does not account for the correct magnetic variation at their operational location, the resulting navigational calculations could mislead the aircraft's heading.

For instance, if a pilot based their heading solely on a magnetic compass without adjusting for magnetic variation, they could end up flying off course, potentially leading to position errors, altitude issues, or even dangerous situations in congested airspace. Understanding and properly applying magnetic variation is critical to ensuring that navigational routes are accurately followed and safety is maintained in aviation operations.