EGNOS Safety of Life assisted service for Maritime users (ESMAS)

Wednesday, March 13, 2024
In Force

The European Geostationary Navigation Overlay Service (EGNOS) provides an augmentation service to the Global Positioning System (GPS) Standard Positioning Service (SPS). Today, EGNOS augments GPS using the L1 (1575.42 MHz) Coarse/Acquisition (C/A) civilian signal function by providing correction data and integrity information for improving positioning, navigation and timing services over Europe. EGNOS will augment both GPS and Galileo in the future, using L1 and L5 (1176.45 MHz) frequencies.

The EGNOS Safety of Life (SoL) assisted service for MAritime userS (ESMAS) is provided openly and is freely accessible without any direct charge. This service is tailored to maritime applications, however its performance and future evolution are driven by the priorities and needs of the existing EGNOS Safety of Life (SoL) service for Aviation. The operational use of this service may require specific authorisation by the relevant authorities in the application sectors concerned.

The purpose of this Service Definition Document is to give information on the ESMAS.

The document describes the EGNOS system architecture and Signal-In-Space (SIS) characteristics, the ESMAS service performance, and provides information on the established technical and organisational framework for the provision of this service. It is intended to be of use to Maritime authorities, Maritime Safety Information (MSI) providers, notification bodies, receiver manufacturers, equipment integrators, GNSS application developers and the final users of the ESMAS.
The document also includes complementary high level information on GNSS concepts, the GPS Service, the EGNOS System/Services, the EGNOS Management structure and EGNOS interfaces with users, as well as the minimum performance characteristics of the ESMAS.

This document is not intended to address EGNOS SoL Service for aviation users, Open Service (OS) nor EDAS performance. Information about the EGNOS SoL Service for aviation users is available in a separate document called the “EGNOS Safety of Life Service – Service Definition Document” (EGNOS SoL SDD); information about EGNOS OS is available in a separate document called the “EGNOS Open Service - Service Definition Document” (EGNOS OS SDD), whilst information regarding EDAS can be found in the “EGNOS Data Access Service (EDAS) – Service Definition Document” (EDAS SDD).

This document will be updated in the future as required in order to reflect changes and improvements to the ESMAS.