Onside Navigation aid or Onside IRS

[George Yogi]

What do you mean by an Onside Navigation aid or Onside IRS ?, Are they different from Radio navigation aid or IRS used for FMGC accurate positioning in AIRBUS ?

[flyboyike]

For the Captain, ADIRS1 and Nav 1 are onside ADIRS and Nav respectively, for the F/O ADIRS2 and Nav 2 are onside. Makes sense?

[George Yogi]

Absolutely

[flyboyike]

Glad to help.