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Introduction to Primary Oceanic/Remote Airspaces
haven't canceled oceanic/remote operation, the
NMC will change to the armed state. If you then climb
above the Oceanic Activation Altitude while still
outside terminal airspace, the NMC will change back
to the active state and the oceanic/remote flight
phase.
Disarm(ed): The NMC's state when it is not monitoring distance and
altitude (for the purposes of oceanic/remote flight) and will not
transition to the oceanic/remote flight phase.
Position Uncertainty: The distance from the reported position to your
actual position. This distance is reported on the Oceanic Status page
when in the oceanic/remote flight phase, there is a RAIM alarm, and
there are enough satellites to calculate it. You are assured that your
actual position is within the displayed distance from your reported
position. If there are not enough satellites to compute the distance, the
position uncertainty will be reported as "Not Available".
As the operator of the NMC, you can only arm or cancel the
oceanic/remote mode of operation. The NMC does the rest.
The diagram below illustrates the different NMC flight phases (except
approach) and their relationship for flight through terminal, en route, and
oceanic/remote airspace. The diagram shows the NMC was armed before
leaving terminal airspace and below the Oceanic Activation Altitude.
30 nm
Departure
Flight Paths & Phases
Other terminology related to TSO-C129a are:
PRN: GPS satellite Pseudo-Random Numbers used to uniquely
identify satellites. This is different than the SVN (Space Vehicle
Number, or the satellites serial number). The RAIM Prediction Ignore
List (RPIL) pages display the PRN number for each satellite. When
excluding satellites from the RAIM Prediction, use the PRN number
found on the NOTAMs and NANUs, not the SVN.
RAIM Alarm Limits
Terminal
Enroute
Oceanic/Remote
Oceanic Arming Point
30 nm
1 nm
2 nm
4 nm
Operations
Oceanic
Activation Altitude
Destination
303
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