The positions of the mode selector of an inertial navigation unit are: OFF - STBY - ALIGN NAV - ATT:

 1 - in "STBY", the unit aligns on the local geographic co-ordinate system 

 2 - the "ATT" position is used during autom: landing (LAND mode)

 3 - in "NAV" the co-ordinates of the start position can be entered

 4 - the platform is levelled before azimuth alignment

 5 -  in cruise, the unit can only be used in "NAV" mode. 

 The combination that regroups all of the correct statements is: