In aviation, a ground-based radio facility that provides signals to guide aircraft along conventional routes is known as a navigation aid, commonly abbreviated as ______.

### Why this is right Ground-based radio navigation aids provide the signals and information used to guide aircraft along conventional routes. The material refers to these facilities as navigation aids, or NAVAIDs. ### The concept A route can be organized into segments between navigation aids. The applicable chart may state the headings, distances, and minimum altitudes for those segments. The aircraft needs certified equipment suited to the aids being used, and it must remain within usable signal coverage. The aid’s presence on a chart does not mean it can be used from every location. ### Terms - **Navigation aid (NAVAID)**: a ground-based or other system that supplies information used for navigation. - **Conventional radio navigation**: navigation based on radio signals from ground facilities. ### Remember A conventional route is built around usable navigation aids and their published procedures.