navigation acronyms, abbreviations and definitions - International ...

HCRF hydrographic chart raster format
HCS heading control system
HD head direction (used in animal navigation)
HDC Hydrographic Data Centre (UK)
HDD head-down display
HDG heading (course)
Angle measured in horizontal plane from a reference direction, counted
clockwise from 000º through 360º, written as a 3 digit number.
HDLC high-level data link control/communication
HDOP horizontal dilution of precision
The factor by which a two-dimensional fix in a horizontal plane is
degraded by geometrical considerations.
HDX half duplex
HEA harbour entrance and approach
HEAP Human Element Analysing Process (IMO)
HELCOM Helsinki Commission (Baltic Marine Environment Protection Comm)
To protect marine environment. Denmark, Estonia, EU, Finland,
Germany, Latvia, Lithuania, Poland, Russia & Sweden.
HeliNet Proposed network of unmanned solar-powered stratospheric
Project funded by EC Fifth Framework for environmental surveillance,
broadband services and positioning.
HEO highly-elliptical orbit (typically 1,500-40,000 km)
HEROE Harmonisation of European Rail Rules for Operating ERTMS (EU)
HEX Horizontal Expansion (programme - eg coverage of 8.33 kHz chnls)
HF high frequency (3-30 MHz) (decametric waves)
HF human factors
HFACS human factors
HFDL high frequency datalink
HFM Human Factors andMedicine Panel (NATO RTO)
Hg Refers to inches of mercury for atmospheric pressure
ISA 1013.2 mB or hPa = 29.92 ins Hg.
HGA high gain antenna
HGE Harmonisation Group on ECDIS
HGMIO Harmonisation Group on Marine Information Objects (IHO-IEC)
HGS head-up guidance system
HGV heavy goods vehicle
HHP high holding power (anchors)
HHS Hodgkin-Huxley-Sense (of earth's magnetic field)
HI High Integrity (Galileo sevice)
HIAL high intensity approach lighting
HIDSS helmet integrated display sighting system (for aircrew)
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March 2012