When preparing for takeoff on runway RWY 18, what heading should the compass and heading indicator display?

When preparing for takeoff on runway RWY 18, the compass and heading indicator should display a heading of 180°. This is because runway headings are generally referenced in terms of magnetic direction, and RWY 18 indicates that the runway is oriented approximately along the 180° heading.

Runway headings are derived from the magnetic azimuth of their centerline rounded to the nearest ten degrees. Since RWY 18 corresponds to a magnetic heading of 180°, this means pilots will aim for this heading during takeoff to align properly with the runway. A heading indicator displaying 185° or any other option would not align perfectly with the runway, which can create confusion or misalignment during takeoff procedures.

Understanding this concept is crucial as it ensures that pilots are properly aligned for takeoff, maintaining safety and efficiency in flight operations.