Non precision question regard 'arming' 'hard altitudes'
In my notes of a non precision approach flown in a b737, whenever intercepting heading you go flaps 5 and then 'arm' LNAV or VOR/LOC.
Whta does it mean by arming the LNAV or VOR/LOC, is this just the same as selecting it i.e. activating the LNAV or VOR/LOC?
Also from my notes, when one mile out you set 'MDA/hard altitude'. What would hard altitude be referring to, a step down fix?