Which description best defines air navigation?

### Why this is right Air navigation combines position awareness with guidance along a route. Monitoring progress matters because the aircraft is moving and cannot normally stop in midair to reconsider its position. ### The concept A route is the intended path between places. Navigation helps a pilot establish where the aircraft is, where it should go next, and whether it is on schedule. Planning also considers weather, airspace, performance, terrain, obstacles, time, and fuel. These factors influence whether a route is practical and safe. ### The other options - **B. Selecting an aircraft’s engine power setting without reference to its position**: this concerns aircraft control, not the full process of navigation. - **C. Following a route only by observing the aircraft’s compass**: a compass gives direction, but does not by itself establish position or route progress. - **D. Measuring an airport’s elevation before takeoff**: elevation may be useful information, but it is only one piece of flight preparation. ### Terms - **Route**: the planned path an aircraft is to follow. ### Remember Navigation links position, route, and progress, rather than relying on a single instrument or measurement.