What action is prohibited regarding navigation markers at an airport?

Interfering with or removing navigation markers at an airport without permission is prohibited because these markers are essential for the safe operation of aircraft navigation. They provide crucial information to pilots for landing, takeoffs, and taxiing, ensuring that aircraft can navigate the airport safely and efficiently. Unauthorized removal or alteration of these markers could lead to confusion and potentially dangerous situations, as pilots rely on them for accurate situational awareness. This regulation is in place to maintain the integrity and safety of the airport environment, ensuring that all navigation aids function as intended for the benefit of all aircraft operations.