Which altitude helps ensure you can receive a navigational signal from a NAVAID?

The correct choice, minimum enroute altitude, is the altitude that guarantees adequate signal reception from a navigational aid (NAVAID) during flight. This altitude is specifically designed to ensure that an aircraft is above any potential obstructions in the area, allowing for reliable communication and navigation signal reception. It also takes terrain and required obstacle clearance into consideration, providing a safe operating environment for pilots.

Minimum reception altitude is concerned with the lowest altitude at which a particular navigational aid can be reliably received, but it does not necessarily provide a blanket assurance of signal reliability across all navigational aids.

Minimum vectoring altitude relates to the lowest altitude at which air traffic controllers can provide vectoring services to aircraft, ensuring safe separation from obstacles. While this may involve reliable navigation, it does not specifically address the reception of NAVAID signals.

Transition altitude is the altitude at which pilots switch from using altimeter settings based on local air pressure to standard pressure settings (29.92 inHg) during ascent. It is key for ensuring proper altitude separation between aircraft but does not pertain to NAVAID signal reception per se.

Thus, minimum enroute altitude is the best choice, as it is tailored for reliable and safe navigation while ensuring signal reception from NAVAIDs