Revisiting RAIM

As usual, you perform a RAIM check before departure. As usual, it comes up good. Okay, but what's going on behind the panel?

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Receiver Autonomous Integrity Monitoring is a mouthful, but it’s descriptive. RAIM independently assesses the integrity of positions reported by a GPS receiver. RAIM is essential because half a dozen error sources can result in position errors ranging from negligible to unsafe. RAIM detects and, in some cases, corrects these errors. Only then can a pilot know […]
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