Glossary
- NA or N/A:Note Applicable
- NAS:National Airspace System or National Air Space
- NATS:National Air Traffic Services (UK)
- NAV:NAVigation sub-system
- NC:Non Compliant
- NCC:Network Control Centre
- NCM:Network Control Management
- NCR:Non-Conformance Report
- NCRB:Non-conformance Review Board
- NI:Non Integrity
- NIHID:Non-Integrity Hazardous Invalid Data
- NLES:Navigation Land Earth Station
- NLES-1B:Backup to NLES-R
- NLES-2B:Backup to NLES-A
- NLES-A:NLES – Aussagel France
- NLES-R:NLES – Riesting Germany
- NLESRD:NLES Requirements Document
- NM:Nautical Mile
- NMC:Network Management Center
- NMF:Network Management Facility
- NOC:Network Operations Centre
- NOCC:Network Operation Control Centre
- NOTAM:Notice To Airmen
- NPA:Non Precision Approach
- NPL:National Physical Laboratory
- NSA:Navigation Service Availability
- NSE:Navigation System Error
- NTW:Network
- NTWRD:Network Requirements Document
- NSV:
Number of Satellite Vehicles