I have to call you on that one. There is no IRS/IRU/ADIRU that updates from any external source...in any civil aircraft, be it Honeywell, Litton, etc. The FMC (FMS) will up date from GPS/DME/LOC/VOR.
Can you expand on your aircraft type and specific model? I suspect it is either a 777 or 747 as both of these use the MMR. The question as I understood it was, can the IRS/IRU/ADIRS be updated by the GPS. To my knowledge the answer is No. The blended positions from the FMC (FMS) are not a result of any IRU, GPS updating, but rather a blened position as a result of all the information gathered. On the 777 you can see these individual values on the POS REF page along with the MAP Display.
Last edited by Spooky 2; 11th Dec 2007 at 21:19.
Reason: more info