Do helicopters fly the same instrument approaches as fixed-wing aircraft? If so, which approach category and minimums do they use?
Helicopters can fly the same standard IAPS. The visibility minimum is the greater of
a) one half the Category A visibility minima, b) 1/4 statute mile visibility, or c) 1200 RVR
We use Category A's MDA/DH. See the AIM 10-1-2 for more information.
Also there are Copter IAPs (example here), and the viz/altitude minimums are stated on those plates.