CPL Navigation Practice Exam 2025 – Complete Study Resource

When RAIM, or Receiver Autonomous Integrity Monitoring, detects an insufficient number of satellites, it alerts the user by displaying a warning on the GPS device. RAIM is a crucial feature in GPS systems used for aviation and navigation, as it ensures the integrity of the satellite signals being received.

If there are not enough satellites in view, typically less than the minimum required (usually four for three-dimensional positioning), the system cannot accurately determine its position. In such cases, it's essential for the user to be made aware of the potential inaccuracy of the navigation solution, which is why the warning is displayed. This alert helps pilots and navigators take appropriate actions, such as switching to alternative navigation systems or holding off on critical decisions that depend on precise location data.

Boosting signals, powering down the receiver, or enhancing accuracy are not features associated with RAIM in situations of insufficient satellite coverage. Instead, the emphasis is on informing users of potential inaccuracies through a visual warning.