throwing a spanner in the works
From the NAIPS GPS RAIM Australia page:
"The Airservices Australia Receiver Autonomous Integrity Monitoring (RAIM) Prediction Service (RPS) provides predictions of RAIM availability for flight planning purposes only.
Pilots-in-command are reminded that the predictions are based on information received from the GPS Operating Authority.
In flight, pilots-in-command should use the RAIM prediction facility of their GPS equipment for RAIM availability predictions.
Presence of RAIM should be continuously monitored whenever GPS is used for navigation."