For example on GNS430 you have a RAIM availability prediction tool : one must enter a waypoint, date and time to compute RAIM availability prediction at +-15min. How big is the area around the waypoint where one can assume RAIM is available ?

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    $\begingroup$ According to this question, aviation.stackexchange.com/questions/1019/… “If that containment bound is more than 1 nautical mile, RAIM is said to be unavailable for terminal procedures. For NPA a 0.3 nautical mile radius is used.” $\endgroup$ – JScarry Dec 6 '18 at 15:40

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