navigation acronyms, abbreviations and definitions - International ...

HPL horizontal protection limit
HPZ helicopter protected zone
HR high risk (marine)
hr hour
HRA high risk area (marine)
HRA human reliability analysis
HRG Hemispherical Resonator Gyro (vibratory gyro for IMU - N Grumman)
HRS height reference surface
HRU hydrostatic release unit
HRV high risk vessel (marine)
HS high sensitivity (eg GPS receiver)
HSB hue, saturation, brightness (system of specifying display colours)
HSC high speed craft
HSC Homeland Security Council (US)
HSC Code International Code of Safety for High Speed Craft (IMO)
HSE Health and Safety Executive (UK)
HSE health, safety and environmental
HSEQ health, safety, environment & quality (elements of marine IMS)
HSGPS high sensitivity GPS
HSI Homeland Security Institute (US)
HSI horizontal situation indicator
HSPDA high speed downlink packet access (mobile phones)
HSSC Hydrographic Services and Standards Committee (IHO)
HSWA Health and Safety at Work Act (UK)
HTML HyperText Mark-up Language (for Web pages)
HTTP HyperText Transfer Protocol
HTZ helicopter traffic zone
HUD head-up display (HUD-LCD uses liquid crystal display)
HUNE horizontal component of the user navigation error
HUNGAGI Hungarian Association for Geo-information
HV host vehicle
HW hardware
HW high water
HX holding to fix
HZ haze (met)
Hz Hertz (cycles per second)
HZA high zenith antenna (eg GPS for elevation >35º)
I in-phase component
I-3, I-4 Inmarsat 3rd or 4th generation satellites
I-4s at 98ºW (Americas), 25ºE (EMEA) & 143.5ºE (Asia-Pacific) 2010.
Carry navigation package, 200 spot beams and comms up to 432 kbps.
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March 2012