Radionavigation-satellite service

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RNSS; here: Automatic dependent surveillance – broadcast

A radionavigation-satellite service (RNSS) is "a radiodetermination-satellite service used for the purpose of radionavigation. This service may also include feeder links necessary for its operation".[1]

RNSS is regarded as a safety-of-life service and an essential part of navigation which must be protected from interferences.


ITU Radio Regulations (article 1) classifies radiocommunication services as:

Examples of RNSS use

Frequency allocation[edit]

The allocation of radio frequencies is provided according to Article 5 of the ITU Radio Regulations (edition 2012).[2]

To improve harmonisation in spectrum utilisation, most service allocations are incorporated in national Tables of Frequency Allocations and Utilisations within the responsibility of the appropriate national administration. Allocations are:

  • primary: indicated by writing in capital letters
  • secondary: indicated by small letters
  • exclusive or shared utilization: within the responsibility of administrations.
Allocation to services
Region 1      Region 2           Region 3     
5 000–5 010 MHz

See also[edit]


  1. ^ ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.43, definition: radionavigation-satellite service
  2. ^ ITU Radio Regulations, CHAPTER II – Frequencies, ARTICLE 5 Frequency allocations, Section IV – Table of Frequency Allocations