In relation to GPS receivers, what is FDE?
FDE is an algorithm that monitors the accuracy and reliability of GPS signals, detects erroneous GPS data, and excludes that data from the active navigation solution. Unlike Receiver Autonomous Integrity Monitoring (RAIM), which will terminate GPS navigation if signal integrity is compromised, FDE actively enables the pilot to continue navigating with GPS technology. FDE offers an increased level of safety to pilots flying over the Atlantic or Pacific or in remote areas where navigation aids are scarce. Most GPS receivers that are found in trans-oceanic aircraft will have provisions for the FDE. Therefore, most handheld GPS units and lower end GPS receivers will not have FDE.
