4-4 North Atlantic Guidance Material
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Edition ab System Safety. A low level of GNSS-based navigation is not expected to affect overall system safety. However, the inherent extremely high horizontal accuracy of GNSS will eventually increase
the probability of collision, following a loss of vertical separation. To mitigate such an effect, it is expected that appropriate operational procedures will have to be considered. This will be necessary when a significant proportion
of aircraft in the NAT use GNSS for navigation. Monitoring the use of GNSS in such airspace is therefore required in order to identify when appropriate operational procedures might be needed and to ensure that system safety is not adversely affected. States of Registry are therefore required to provide details of GNSS approvals to the North Atlantic Central Monitoring Agency
(CMA). (See Part 5) b)
Institutional Considerations. Whilst the NAT SPG should be cognisant of institutional considerations, it is the responsibility of individual States to resolve such concerns. States may wish to take account of the following institutional aspects i)
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