| AIS |
Automatic Identification System |
| AMT |
Aeronautical Mobile Telemetry |
| AM(R)S |
Aeronautical Mobile (route) Service |
| BSS |
Broadcasting-Satellite Service |
| CEPT |
European Conference of Postal and Telecommunications Administrations |
| CITEL |
Inter-American Telecommunications Commission |
| DSC |
digital selective calling |
| EESS |
Earth Exploration-Satellite Service |
| eirp |
equivalent isotropically radiated power |
| FS |
Fixed Service |
| FSS |
Fixed-Satellite Service |
| GMDSS |
Global Maritime Distress and Safety System |
| GSO |
geostationary-satellite orbit |
| HAPS |
High Altitude Platform Station |
| HF |
high frequency |
| HDFSS |
High-Density applications in the Fixed-Satellite Service |
| ICAO |
International Civil Aviation Organization |
| IMT |
International Mobile Telecommunications |
| ITU |
International Telecommunication Union |
| ITU-R |
International Telecommunication Union – Radiocommunication Sector |
| LF |
low frequency |
| MetSat |
Meteorological Satellite Service |
| MF |
medium frequency |
| MLS |
microwave landing systems |
| MS |
Mobile Service |
| MSS |
Mobile-Satellite Service |
| NAVTEX |
navigational telex |
| PFD |
power flux density |
| RR |
Radio Regulations |
| SAR |
synthetic aperture radar |
| SOLAS |
International Convention for the Safety of Life at Sea |
| SRS |
Space Research Service |
| UTC |
coordinated universal time |
| VHF |
very high frequency |
| WRC-XX |
World Radiocommunication Conference (XX = year of conference) |
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