NP281 (Parts 1 & 2) - Maritime Radio Stations
NP282 - Radio Aids to Navigation, Satellite Navigation Systems, Differential GPS (DGPS) Legal Time, Radio Time Signals and Electronic Position Fixing Systems
NP 283 (Parts 1 & 2) - Maritime Safety Information Services
NP 284 - Meteorological Observation Stations
NP 285 - Global Maritime Distress and Safety System (GMDSS)
NP 286 (Parts 1 - 7) - Pilot Services, Vessel Traffic Services and Port Operations