![]() For enroute mode the RAIM value should be under 2 NM, terminal mode under 1 NM, and approach mode 0.3 NM. This calculated value can be compared to the required integrity for the phase of flight and if it is not acceptable, warn the pilot. The difference in the positions can be used to estimate the integrity of the position. This generates 5 possible positions or more. ![]() If more satellites are in view, then one of the four satellites being used for the position can be substituted one at a time with one of the extra unused satellites. It works on the principal that a position takes 4 satellites in view. ![]() RAIM is a calculation that a GPS receiver makes to determine if the position information is suitable for the navigation mode the receiver is using.
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