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H24 Continuous day and night service

HBN Hazard beacon

HDF High frequency direction finding station

HDG Heading

HEL Helicopter

HF High frequency (3000 to 30000 kHz)

HGT Height or height above

HJ Sunrise to sunset

HLDG Holding

HN Sunset to sunrise

HOL Holiday

HPa Hectopascal

HR Hours

HS Service available during hours of schedule operation

HVY Heavy (used to qualify weather phenomena such as rain, e.g. heavy hail = HVYGR)

HX Not permanently active, no specific working hours

Hz Hertz (cycle per second)