Final answer:
If RAIM is not available when setting up for a GPS approach, the pilot should use alternative navigation methods such as VOR or NDB, refer to the approach plate, and communicate with air traffic control.
Step-by-step explanation:
If RAIM (Receiver Autonomous Integrity Monitoring) is not available when setting up for a GPS approach, the pilot should use alternative navigation methods to ensure safety. Here are the steps the pilot can take:
- Deploy other navigation aids such as VOR (VHF Omnidirectional Range) or NDB (Non-Directional Beacon) to supplement or replace GPS navigation.
- Refer to the approach plate to identify any available ground-based navigation aids or visual references that can be used to navigate accurately.
- Communicate with air traffic control for guidance and assistance, informing them about the lack of RAIM availability.