1 The Maritime Safety Committee, at its 102nd session (4 to 11 November 2020), pursuant to
operative paragraph 4 of resolution
A.1046(27) on Worldwide Radionavigation System, recognized the Indian
Regional Navigation Satellite Systems (IRNSS), proposed by India, as a component of the
Worldwide Radionavigation System.
2 The Committee's decision was based on the recommendation and assessment made by the
Sub-Committee on Navigation, Communications and Search and Rescue (NCSR), at its seventh
session (15 to 24 January 2020), in accordance with the requirements set out in resolutions
A.1046(27) and A.915(22), noting the agreement of the Sub-Committee that IRNSS
meets the operational requirements to assist in the navigation of ships in ocean waters
within the area covered by 55°E longitude, 50°N latitude, 110°E longitude and 5°S latitude.
3 Administrations should note that in the port area, as a stand-alone system, IRNSS will
not meet the accuracy requirements as specified in appendix 2 of resolution A.915(22).
However, with differential correction techniques, such as D-IRNSS, it will enhance the
accuracy and help meet the accuracy requirements in port areas, as mentioned in appendix 2
of resolution A.915(22).
4 IRNSS does not provide instantaneous integrity warning of system malfunction.
Administrations may wish to note that receiver autonomous integrity monitoring (RAIM) can
provide this facility. It should also be noted that the accuracy and integrity of the
system can be greatly enhanced by the use of differential correction techniques using
either local or wide area augmentations, or both.
5 Member States are invited to bring this information to the attention of all parties
concerned.