H | High pressure area or the centre of hight pressure |
H24 | Continuous day and night service |
HAPI | Helicopter approach path indicator |
HBN | Hazard beacon |
HDF | High frequency direction−finding station |
HDG | Heading |
HEL | Helicopter |
HEMS | Helicopter Emergency Medical Service |
HF | High frequency (3 000 to 30 000 kHz) |
HGT | Height or height above ... |
HJ | Sunrise to sunset |
HLDG | Holding |
HN | Sunset to sunrise |
HO | Service available to meet operational requirements |
HOL | Holiday |
HOSP | Hospital aircraft |
HPA | Hectopascal |
HR | Hours |
HS | Service available during hours of scheduled operations |
HURCN | Hurricane |
HVDF | High and very high frequency direction−finding stations (at the same location) |
HVY | Heavy |
HVY | Heavy (used to indicate the intensity of weather phenomena, e.g. HVY RA = heavy rain) |
HX | No specific working hours |
HZ | Haze |
HZ | Hertz (cycle per second) |