why do aviation things like charts and runways and such switch back and forth between true north and magnetic north? What’s the point of orienting anything to true north when all the instruments that can measure direction are only capable of using magnetic north?

Question

Seems like pilots have enough to worry about without having to memorize when to use which north, especially when they can only actually orient to one of the norths.

In: 2

Answer 1

Also, there are local magnetic anomalies that can alter the direction of magnetic north by several degrees for just a few miles. This is especially true in areas that have iron deposits in the crust.