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Checking runway and SID display on the ND in comparison with the aircraft symbol representing the aircraft present position, (ARC or NAV mode, range 10 nm) during taxi, is a good way to check the global consistency of FMGS entries (Position and flight plan).
"RESET IRS TO NAV" MCDU MESSAGE
When the ADIRS are in NAV mode, and new origin airport coordinates are inserted, the RESET IRS TO NAV message triggers.
This occurs in transit, when the flight crew enters a new CO-RTE, or enters a new FROM-TO airport pair on the INIT A page, and does not re-align the ADIRS.
In this case, check the coordinates on the INITA page and compare them with:
? The coordinates of the origin airport, that are provided on the Airport chart, in order to detect a possible error in airport entry
? The ADIRS position (IRS monitor page).
In most cases the ADIRS position and the airport position do not differ significantly. Therefore, the message may be cleared without realigning the IRSs.
ADIRS INITIALIZATION
Criteria: P8194, SA
4 Applicable to: MSN 2907-4078
 
ALIGNMENT
At the beginning of the pre-flight checks, the crew sets the ADIRS selectors to NAV, in order to start alignment.
The alignment takes approximately 10 min, and must be completed before pushback (before any aircraft movement).
 

  NORMAL OPERATIONS
PRE START
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

IN TRANSIT:
ADIRS re-alignment is only necessary, if one of the ADIRS displays a residual ground speed greater than 5 kt.
In this case, a rapid re-alignment should be performed on all 3 IRSs (by setting all the ADIRS to OFF, then all back to ON within 5 s). The fast alignment takes approximately one minute. It involves setting the ground speed to 0, and updating the IRS position to the position of the coordinates on the INITA page (usually airport reference coordinates).
INITIALIZATION
The ADIRS are automatically initialized at the GPS position. These GPS coordinates are displayed on the MCDU INIT A page, in replacement of the airport reference coordinates, after the pilot entered the FROM-TO airport pair.
When performing the BEFORE START C/L, the crew will check that the IRS IN ALIGN ECAM MEMO has disappeared, as a confirmation that the ADIRS are in NAV mode.
Checking runway and SID display on the ND in comparison with the aircraft symbol representing the aircraft present position, (ARC or NAV mode, range 10 nm) during taxi, is a good way to check the global consistency of FMGS entries (Position and flight plan).
"RESET IRS TO NAV" MCDU MESSAGE
When the ADIRS are in NAV mode, and new origin airport coordinates are inserted, the RESET IRS TO NAV message triggers.
This occurs, in transit, when the crew performs a fast alignment, since this fast alignment is usually completed before the crew enters the FROM-TO airport pair.
　
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