Radio/Navigation/Flight Instruments

Question 1

what does the green dot represent?

Answer 1

drift down speed
1.3gs above stick shaker
40* of bank angle
25: if flying in icing add 10kts

Question 2

how long can the IRS take to align itself?

Answer 2

up to 17min

Question 3

which IRS systems are used by the FO/captain. what does the IRS system revert to when it fails?

Answer 3

2/1/3