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Thread: RAIM Check
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Old 27th May 2014, 23:35
  #39 (permalink)  
underfire
 
Join Date: Aug 2013
Location: PA
Age: 59
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no worries.
RAIM predictions from the State Source are based on a 24 hour timeframe, and just means you are good to go with that flight plan.

Real time RAIM, and the reported HIL/HPL are a much different matter. Understanding those, in combination with HAL...that is what is really important when navigating.

It is virtually impossible to determine what HAL is (part of the FMS secret sauce)

I will say this (as an example) with HW, the 'circle' when set to 0.3RNP will alarm over 0.51/0.60. Sometimes it is useful to understand just how far off one is on alarm.

EDIT: I just love the AUS NOTAM's, based on ARP.....
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