Always under construction By Hugh Stegman nv6H

GCCS (1) Global Command Control System, obsolete US Air Force

(2) Global Command & Control System, 1992 data network plan to

replace WWMCCS computers

GCCS-J Global Command & Control System - Joint

GCHQ Government Communication Headquarters ("G;" UK comint)

GCMP Guam Composite Broadcast (obsolete USCG)

GCN (1) ground communications network

(2) ground control network

GCSS Global Combat Support System

GD CW brevity: Good Day

GDIP General Defense Intelligence Program

GDO Grid/Gate Dip Oscillator

GDOC Geographical Display Operations Computer

GDR Ground Data Reduction

GDSS Global Decision Support System

GE (1) General Electric

(2) CW brevity: Good Evening

(3) Guerra Elettronica (Italian for Electronic Warfare)

GENSER (1) General Security Regulations

(2) general service

GENTEL General Telephone Company

GEO Geostationary Earth Orbit

GEODSS Ground-based electro-optical deep space surveillance

GEOS (1) Geodynamic experimental ocean satellite

(2) Geomagnetic earth observation system

(3) Graphic Environment Operating System

GEP Ground Entry Point

GES Ground Earth Station

GETS Government Emergency Telecommunications Service (US NCS)

GFA Graphical Area Forecast

GFAE Government-furnished aerospace equipment

GFB Go-Fast Boat

GFDL Geophysical Fluid Dynamics Laboratory

GFE (1) Government-furnished equipment

(2) God-Furnished Equipment (ionosphere)

GFI (1) Government-furnished information

(2) Ground Fault Interrupter

GFM Government-furnished material

GFP (1) Government Furnished Property

(2) Government-furnished part

GFS Global Forecast System (US wx model)

GG Transmission is in German

GHFS Global High Frequency System (US Air Force)

GHz GigaHertz

GI (1) Government Issue

(2) Old slang, from above: U.S. soldier

GID Group Identification

GIF Graphics Interchange Format, first used on CompuServe

GIGO Garbage In, Garbage Out; first rule of computing

GIMP GNU Image Manipulation Program, a nested acronym

GIS Geographical Information System

GKS Graphical Kernel System

GLOB Ground Loving Old B-----d (KC-135)

GLONASS GLObalnaya NAvigatsionnaya Sputnikovaya Sistema (Global Navigation Satellite System, Russian version of GPS)

GLS GNSS Landing System

GM (1) CW brevity code: Good Morning

(2) General Motors

(3) General Manager

(4) Guided Missile

GMDSS Global Maritime Distress & Safety System

GMF (1) Ground Mobile Force

(2) Government Master File (frequencies)

GMI General Military Intelligence

GMRA Great Man-made River Authority (Libya)

GMRS General Mobile Radio System

GMS Geostationary Meteorological Satellite (Japanese)

GMSK Gaussian Minimum Shift Keying

GMT (1) Greenwich Mean Time (obsolete, still UK's name for standard time)

(2) Ground Moving Target

GMTI Ground Moving Target Indication

GNA Gulf News Agency

GNC (1) guidance and navigation computer

(2) guidance, navigation and control

gnd ground

GNDCON Ground Control

GNSS Global Navigation Satellite System

gnu Gnu's Not Unix, a freeware op-system (recursive acronym)

GO General Officer

GOA Gone on Arrival (police)

GOES (1) Geosynchronous Oceanic & Environmental Satellite

(2) Geostationary Operational Environmental Satellite

GOGO government-owned, government-operated

GOJ Government of Japan

Gopher TCP/IP protocol for file searches, still used by some [~]

GORIZONT Moscow State University Geostationary Monitor satellite

GOSIP Government Open Systems Interconnection Profile (UK & US)

GOTS Government-off-the-shelf

gov Government site (Internet)

GOWON Gulf Offshore Weather Observing Network

gp Group

GPIB General Purpose Interface Bus

GPM Gallon(s) per minute

GPO (1) Government Printing Office (US)

(2) General Post Office

GPR Ground Penetrating Radar

GPRS General Packet Radio Service

GPS Global Positioning System

GPS RTK Global Positioning System Real-Time Kinematics

GR Hail (from French)

GRADU Gradual weather change

GRC General Radio Communications (AN/GRC-xxx)

GRDCUS Gulf Range Drone Control Upgrade System

grep Global Regular Expression, Print; Unix text search

GRI Group Repetition Interval (Loran)

grp Group

GRT Gross register tonnage

GS (1) General support

(2) Group Separator (ASCII)

(3) small hail and/or snow pellets

(4) Ground Stop

(5) Ground Station

GSA General Services Administration (US)

GSAC Ground support associate contractor

GSC (1) Ground systems controller

(2) Ground support contractor

GSCO Ground systems control officer

GSD General support division

GSE Ground support equipment

GSF GPS support facility

GSFC Goddard Space Flight Center, Greenbelt, MD

GSM Global System for Mobile communications (EU cell phone mode)

GSM-900 Group Speciale Mobile (Europe)

GSMP General Switch Management Protocol

GSO (1) GeoStationary Orbit

(2) Geostationary Satellite Orbit

GSTS Ground-based surveillance and tracking system

G-SWF Gradual Shortwave Fadeout (ionospheric disturbance)

G/T (Rcv antenna) Gain over noise Temperature

GTC Greek Telegraphy Club, aka SV-CW-C

GTK GIMP Tool Kit, a deeply nested acronym

gTLD generic top-level domain

GTO (1) geosynchronous transfer orbit

(2) fast car made by Ferrari ("Gran Turisimo Omologato")

(3) not quite so fast car made by Pontiac

GTOC Geosynchronous transfer orbit capability

G-TOR Golay Transmissions Over Radio (Kantronics version of PACTOR)

GTS Global Telecommunication System (WMO)

GUHOR Informal: "I don't hear you" (Loosely, from Russian prosign) [~]

GUHOR Stick (1) Informal: Net diagramming tool used in Cold War COMINT

(2) Wouff Hong substitute (see Wouff Hong)

GUI Graphical User Interface

GUID Globally Unique Identifier

GVAR GOES Variable

GW (1) Gigawatt

(2) CW brevity code: Good Evening

(2) Ground wire

GWARC General World Administrative Radio Conference

GWEN Ground wave emergency network (old VLF strategic net)

GWT Gross Weight Tonnage

H (1) Henry (unit of inductance)

(2) Magnetic field

h/w Hardware

H24 All 24 hours; station operates continuously

HA ("Hotel Alpha") human remains

HAARP HF Active Auroral Research Program

HAAT Height Above Average Terrain

HAC (1) higher authority communications(USAF)

(2) heading alignment circle (NASA)

(3) Hughes Aircraft Company, obsolete

HAES High Altitude ELINT System

HAF Headquarters Air Force

HAL (1) High-order Assembly Language (space shuttle computers); named for:

(2) Heuristically programmed Algorithmic Computer (2001: A Space

Odyssey)

HAMP Horizontal Avionics Modernization Planning

HAMS Hilltop Amateur Mastertie System; old, big SoCal 440 MHz system

HAR Highway Advisory Radio

HARCO Harris Radio Company, makes HF setups

HARM High-Speed Anti-Radiation Missile

HAS Hardened Aircraft Shelter

HASA High Altitude SIGINT Architecture

HBD (1) Has Been Drinking (police)

(2) Hot Box Detector (railroad)

HBI Horizontal Blanking Interval (TV)

HBO Home Box Office (TV network)

HBS Heart Beat Signal (Australian Internet)

HBT Heterojunction Bipolar Transistor

HC-ARQ Hagelin-Cryptos simplex teleprinter system

HCI Human-Computer Interface

HCJB Heralding Christ Jesus' Blessing (callsign)

HCP Health and comfort package

H-CPM Harmonized Continuous Phase Modulation

HD (1) Hard Disk

(2) High Density

(3) High Definition

HDB High-Density Bipolar

HDD (1) Hard Disk Drive

(2) Heads Down Displays

HDLC High-level Data Link Control, old synchronous computer protocol

HDOP Horizontal Dilution of Precision (DGPS)

H-DQPSK Harmonized Differential Quadrature Phase-Shift Keying

HDR High Data Rate

HDS Hard Disk Subsystem

HDSL High-rate Digital Subscriber Line

HDTV High-Definition Television

HDX Half-duplex

HE (1) high energy

(2) high explosive

HE-AAC High-Efficiency Advanced Audio Coding

HEAR Hospital Emergency Alert Radio (SoCal)

HEC High-Endurance Cutter (USCG)

HEMP High-altitude electromagnetic pulse

HEMT High-electron-mobility transistor

HEMTT Heavy expanded mobility tactical truck

HEO (1) high earth orbit

(2) highly elliptical orbit

HEP Head End Power (railroad locomotives)

HERE Hazards of Electromagnetic Radiation to Equipment

HERF High-Energy RF (weapons)

Hertz Unit of frequency, named for Heinrich Hertz, 1Hz=1 cps

HES Hurricane Evacuation Study

HETS (1) heavy equipment transporter system

(2) heterodynes [~]

Hex Hexadecimal number notation, base 16

HF High Frequency (3-30 MHz)

HF-ALE High Frequency Automatic Link Establishment

HFBC High-Frequency broadcasting

HFC Hybrid Fiber/Coax

HFCC High-Frequency Coordination Conference

HFDL High-Frequency Data Link, single-tone digital aero mode

HFDLP HF Data Link Protocol

HFDR HF Data Radio

HFDU HF Data Unit

HFDVL HF Data and Voice Link

HFET Heterostructure Field-Effect Transistor

HFGCS High Frequency Global Communications System (Scope Command)

HFIA HF Industry Association

HFMOD Australian Defence Force High Frequency Modernisation Project

HFNC HF Network Controller

HFNPDU HFDL: High Frequency Network Protocol Data Unit

HFO (1) High-Frequency Oscillator

(2) Honolulu Forecast Office

HFS Hierarchical File System

HFSWR High-Frequency Surface-Wave Radar

HGA High-Gain Antenna

HHS (Dept. of) Health & Human Services

HHT (1) Hand-Held Terminal

(2) Hand-Held Tester

HI CW brevity code: a laugh (all dits, easier to send than "HA")

HICOM High Command net (US Navy)

HIDAR High Data Rate

HIFER High-Frequency Experimental Radio (low-power ~13.5 MHz)

Hi-fi High Fidelity (audio)

HIPAS High-Power Auroral Stimulation

HIPPI High Performance Parallel Interface

HIRF High Intensity Radiation Fields

HISCAT High-latitude, High-altitude, High-power, High-frequency, High-

performance, Heating and Ionospheric Scatter facility (research)

HITRON Helicopter Interdiction Tactical Squadron (US Coast Guard)

HIWAS Hazardous Inflight Weather Advisory Service

HJ ("Hotel Juliet") Hijack

HK Handle Key (Windows registry)

HKCC Handle Key, Current Configuration (Windows registry)

HKCR Handle Key, Classes, Root (Windows registry)

HKCU Handle Key, Current User (Windows registry)

HKDD Handle Key, Dynamic Data (Windows registry)

HKEY Handle to a KEY (Windows Registry)

HKG Hong Kong (old country code)

HKLM Handle Key, Local Machine (Windows registry)

HKTI Hong Kong Telecom International

HKU Handle Key, Users (Windows Registry)

HLD HomeLand Defense (DHS)

HLR Home Location Register

HM Her Majesty

HM01 Hybrid Mode #1; Cuban numbers combining voice and digital

HMCS Her Majesty's Canadian Ship

HMIC Hybrid Microwave Integrated Circuit

HMMWV High mobility, multipurpose wheeled vehicle (hummvee)

HMS Her Majesty's Ship

HND Honduras (country code)

HNG Hungary (country code)

HNG-FEC Hungarian diplo FEC teleprinting system

HNMP HF Network Management Protocol

HNS Host nation support

HOLF Helicopter Outlying Landing Field

HP (1) High Pass (filter circuit)

(2) Highway Patrol

hp Horsepower

Hpa Hectopascal

HPA High-Power Amplifier

HPC Hydrometeorological Prediction Center, MD

HPE CW brevity code: "Hope to..."

HPG Hardcopy Processor Group

HPI High-Priority Intercept (global HF comint system)

HPM High Power Microwave

HPTS High-Power Transmitting System (TACAMO)

HQ Headquarters

HQAN HAVE QUICK A-Net

HQDA Headquarters, Department of the Army

HR High Resolution

hr Hour

HR Hybrid Receive

HRC Harmonically Related Carrier (CATV channel scheme)

HRCS High Resolution Camera System

HRMP HF Relay Management Protocol

HRO (1) Ham Radio Outlet (store)

(2) Old National receiver line, might mean "Hell of a Rush Order"

HRPT High Resolution Picture Transmissions

HRR High Resolution Radar

hrs Hours

HRT (1) Hostage Rescue Team (FBI)

(2) Hrvatske Radio Televizije (Croatian)

HRV Croatia (country code)

HSAL High Speed Algebraic Logic

HSFB High Speed Fleet Broadcast

HSI Hyperspectral Imaging

HSIP H Camera Sensor Improvement Program

HSSP HF Station Status Protocol

HST (1) Hawaiian Standard Time

(2) Hubble Space Telescope

HT (1) Handie-talkie, a hand-held radio

(2) Horizontal Tab (ASCII)

HTI (1) Haiti (country code)

(2) Hostile Target Identification

HTML Hypertext Markup Language (world wide web)

HTS High Temperature Superconducting

HTTP HyperText Transmission Protocol (WWW)

HTTPD HTTP Daemon (Unix)

HTTP-NG HTTP Next Generation

HTTPS (1) HTTP Server

(2) HTTP with Secure Sockets Layer

HUD Heads-up Displays

HULTEC Hull to Emitter Correlation

HUMINT Human Intelligence (spies!)

HVAC Heating, Ventilation, Air Conditioning

HVAR High-Velocity Aerial Rocket

HW CW brevity code: "How do you copy me?"

HWRF Hurricane Weather Research and Forecasting (model)

hx Signal is a harmonic

HYDROLANT US warnings for Atlantic and east

HYDROMET Hydro-Meterological bulletin or warning

HYDROPAC US warnings for Pacific Ocean and west

Hyperfix Hyperbolic Radio Navigation System, obsolete

HZ haze

Hz Hertz (a "cycle per second")

I (1) Current (in amperes, amps)

(2) Packet designator: information frame

(3) Italy (country code)

I/O Input/Output (computers)

I/Q In-phase/ Quadrature

i18n Alphabet scheme for multi-lingual computer programs [~]

IA (1) Information Assurance

(2) Italian Army

(3) Short for IATSE, the movie/theatrical production union

(4) Information Attack

IAAFA Inter-American Air Forces Academy

IAB Internet Architecture Board

IAC International Analysis Code (weather codes FM-45, FM-46)

IADS Integrated Air Defense System

IAEM International Association of Emergency Managers (was NCEM)

IAF Italian or Irish air force

IAG Imagery Analysis Group

IAGA International Association of Geomagnetism and Aeronomy

IAIP Information Analysis and Infrastructure Protection

IANA Internet Assigned Numbers Authority

IAP International AirPort

IAPS I Am Pretty Sure

IARN International Amateur Radio Network

IARP International Amateur Radio Permit (to operate overseas)

IARU International Amateur Radio Union

IARUMS IARU Monitoring Service

IAS (1) Image Access Service

(2) Indicated Air Speed

(3) Intelligence Analysis System

IATA International Air Transport Association

IAU International Astronomical Union

IAVTR Integrated Audio Visual Transmitter/ Receiver

IAW In accordance with

IBB International Broadcasting Bureau (US)

IBC (1) International Broadcast Center (Olympics)

(2) Italian Broadcasting Corporation

IBCT Initial Brigade Combat Teams

IBDL Inter Battery Data Link

IBM (1) International Business Machines (company)

(2) de facto PC standard, though few are true blue

IBOC In-band, on-channel (digital broadcasting)

IBW Instantaneous BandWidth

IC (1) Integrated circuit (chip)

(2) Incident Command

(3) Ice crystals

(4) In-cloud lightning

ICAO International Civil Aviation Organization

ICAP Internet Calendar Access Protocol

ICAS Intermittent Commercial and Amateur service (rating)

ICBM Intercontinental Ballistic Missile

ICD Interface Control Document

ICE (1) Immigration and Customs Enforcement

(2) Intrusion Countermeasures Electronics

ICIS Interagency Communications Interoperability System (SoCal)

ICM Intelligence Correlation Module

ICMP Internet Control Message Protocol

ICNIA Integrated Communications Navigation IFF Avionics

ICNIS Integrated Communication Navigation and ID System

ICOM (1) Intercom

(2) Japanese radio mfr [~]

(3) Integrated COMSEC

ICON Image Communication and Operations Node

ICP Internet Cache Protocol

ICPO International Criminal Police Organization, see INTERPOL

ICQ "I Seek You" (old Internet message program) [~]

ICRC International Committee of the Red Cross

ICS Incident Command System

ICSTIS Independent Committee for the Supervision of Standards of

Telephone Information Services (UK)

ICW interrupted continuous wave

ID (1) Identification

(2) Inside Diameter

IDAS (1) Integrated Air Defense System

(2) Indoor Distributed Antenna System

(3) ICOM Digital Advanced System

IDASS Integrated Data Analysis System for Spacecraft

IDCP ID Data Combining Process

IDE (1) Intelligent Drive Electronics (small HD standard)

(2) Integrated Drive Electronics

(2) Integrated Developer Environment

IDEA International Data Encryption Algorithm

IDECM Integrated Defensive ECM

IDFG Inverse Discrete Fourier Transform

I-DGS Interim-Deployable Ground Station

IDLH Immediate Danger to Life and Health

IDLM Interference Detection, Locating, and Mitigation

IDM Improved Data Modem

IDN Internationalized Domain Names

IDPS Interim Digital Processing System

IDSL ISDN Digital Subscriber Line

IDT InterDigital Transducer

IEC International Electrotechnical Commission

IED (1) Improvised Explosive Device

(2) Imitative Electronics Deception

IEE (1) Institute of Electrical Engineers (US), merged with IRE

(2) Institution of Electrical Engineers (UK)

IEEE Institute of Electrical & Electronics Engineers, former IRE

IETF Internet Engineering Task Force

IF Intermediate Frequency (of a receiver)

IFE Inflight emergency

IFF (1) Identification, Friend or Foe

(2) Logic operation: "if and only if"

IFIM International Flight Information Manual

IFK Incremental Frequency Keying

IFK+ Offset Incremental Frequency Keying

IFL International Frequency List, ITU doc

IFM Instantaneous Frequency Measurement

IFOR Implementation Force ("UN peacekeepers")

IFP Image Formation Processor

IFPFP Individual Flight Plan From this Point

IFPS Interactive Forecast Preparation System

IFR (1) Instrument Flight Rules

(2) "I Follow Roads"

IFRB International Frequency Registration Board

IFRC Int'l Federation of Red Cross/Red Crescent

IFSAR Interferometric Synthetic Aperture Radar

IGBT Insulated Gate Bipolor Transistor

IGDL Interoperable Ground Data Link

IGFET iIulated-Gate Field-Effect Transistor

IGMP Internet Group Management Protocol

IGMP Internet Group Management Protocol

IGP Interior Gateway Protocols

IGRP Interior Gateway Routing Protocol

IGY International Geophysical Year, big 50's research interval

IHFR Improved high frequency radio

IHO International Hydrographic Organization

IHS Internal Hostile Structured threat

IHU Internal Hostile Unstructured threat

IJMS Interim JTIDS/MIDS Message Specification

IL Intermediate Language (Object-oriented computing)

ILC Integral Locomotive Computer (railroad)

ILEAS Illinois Law Enforcememt Alarm System

ILS Instrument Landing System

IM (1) Intermodulation, causes spurious signals or distortion

(2) Integrity Monitor (DGPS)

IMA Individual Mobilization Augmentee (FEMA)

IMAP Internet Message Access Protocol

IMBE Improved Multi-Band Excitation

IMC Internet Mail Consortium

IMD Intermodulation Distortion

IMDN Intelligent Mobile Data Network

IMEI International Mobile Equipment Identity

IMETS Integrated Meteorological System

IMHO In My Humble Opinion (Internet)

IMI CW prosign: interrogative; more often written "?"

IMINT Imagery Intelligence

IMIS Integrated Maintenance Information System

IMM Image Manifest Message

IMN Iraqi Media Network

IMO (1) International Maritime Organization, part of UN

(2) In My Opinion (Internet)

IMP Intermodulation Products

IMR Intermodulation Rejection

IMS Integrated Maritime Surveillance

IMSA International Municipal Signal Association

IMSI International Mobile Subscriber Identity

IMSP Internet Message Support Protocol

IMTS Improved Mobile Telephone System

IN (1) Intelligent Network

(2) Indian Navy

(3) Intelligence

in inch

INA Iraqi News Agency

IND India (country code)

indiv individual(s)

INEFC Interagency National Emergency Fire Cache

INFOSEC Information systems security

ING International Notification Group(of IRAC)

inHg inch of Mercury (air pressure)

INMARSAT Intl. Maritime Satellite Org, a consortium, leases bandwidth on Marecs,

Intelsat, Marisat for ship use.

INMARSAT-A Inmarsat mobile voice/data terminal

INMARSAT-B Improved version, replaced A

INMARSAT-C Data-only INMARSAT terminal, also for SAFETYnet

INMARSAT-E INMARSAT EPIRB

INMARSAT-M INMARSAT terminal, voice only, not GMDSS-compliant

INO Indian Ocean (MWARA)

InP Indium Phosphide

INS (1) Immigration & Naturalization Service (US, now part of ICE)

(2) Inertial Navigation System

(3) Indonesia (country code)

(4) Internal Non-Hostile Structured threat

INSCOM US Army Intelligence and Security Command

INT (1) Interrogative (precedes a question)

(2) Prosign: turns a Z signal into a question

(2) International

(3) Interrupted (transmission)

(4) Interrupt (computer processing)

intel Intelligence

INTELCAST Intelligence Broadcast

INTELNET Intelligence Network

Internet Global interconnection of regional nets using TCP/IP

InterNIC Internet Network Information Center

INTERPOL International Criminal Police Organization

Intl International, internal

INU Internal Non-Hostile Unstructured threat

IOC Index of co-operation (a fax parameter)

IOD Issue Of Data (DGPS)

IOM Installation, operation and maintenance