Glossary
- IALA:International Association of Lighthouse Authorities
- IATA:International Air Transport Association
- ICAO:International Civil Aviation Organisation
- IERS:International Earth Rotation Service
- IGS:International GPS Service for Geodynalics
- ILS:Instrument Landing System or Integrated Logistics Support
- IMO:International Maritime Organisation
- INC:Inmarsat Navigation Center
- INMARSAT:International MARitime SATellite
- INS:Inertial Navigation System
- IOC:Initial Operational Capability
- IOD:Issue Of Data or Issuance Of Data
- IODC:Issuance Of Data Clock
- IODE:Issuance Of Data Ephemeris
- IODI:Issuance Of Data Ionosphere
- IODP:Issuance Of Data PRN
- IOP:Initial Operations Phase
- IOR:INMARSAT III – Indian Ocean Region
- IP:Internet Protocol
- IPP:Ionospheric Pierce Point
- IRD:Interface Requirements Document
- IRS:Inertial Reference System
- ISDN:Integrated Services Digital Network
- ISNS:International Satellite Navigation System
- ISO:
International Organization for Standardization
- ISOP:In Service Operations Phase
- ISVV:Independent Software Verification and Validation
- ITRF:International Terrestrial Reference Frame
- ITT:Invitation To Tender
- ITU:International Time Unit
- IoT:
Internet of Things
- IDD:
Internet Data Distribution
- IRIS²:
Infrastructure for Resilience, Interconnectivity and Security by Satellite