# Commission Implementing Decision (EU) 2015/1183 of 17 July 2015 setting out the necessary technical and operational specifications for implementing version 3 of the EGNOS system, Appendix: ACRONYMS

Extent: E+W+S+N.I.

APV Approach Procedure with Vertical Guidance
CAT Category
EDAS EGNOS Data Access Service
EGNOS European Geostationary Navigation Overlay Service
EU-MS European Union Member States
FIR Flight Information Region
Galileo E1 E1 frequency of Galileo system, corresponding to 1 575,42 MHz
Galileo E5a E5a frequency of Galileo system, corresponding to 1 176,45 MHz
GPS Global Positioning System
GPS L1 L1 frequency of GPS system, corresponding to 1 575,42 MHz
GPS L5 L5 frequency of GPS system, corresponding to 1 176,45 MHz
HAL Horizontal Alert Limit
ICAO International Civil Aviation Organization
IMO International Maritime Organization
LPV Localizer Performance with Vertical guidance
OS Open Service
RIMS Ranging and Integrity Monitoring Station
SARPs Standard and Recommended Practices
SBAS Satellite-Based Augmentation System
SoL Safety of Life
UTC Coordinated Universal Time
VAL Vertical Alert Limit
VNSE Vertical Navigation System Error

---
Source: https://www.legislation.gov.uk/eudn/2015/1183/annex/appendix (the official version)
Page: https://openlegislation.uk/eu-decision-2015-1183/annex/appendix
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.