Man må ha et sertifikat for hver
CAT, og bare CATIII har tre stykker.
CAT III A:
DH lower than 30 m or no DH, RVR not less than 200 m
CAT III B:
DH lower than 15 m or no DH
RVR less than 200 m but not less than 50 m
CAT III C:
No DH and RVR limitations
Kilde:
http://www.icao.int/icao/en/anb/meet..._limvis_en.pps