The Galileo Open Service (OS), the Galileo High Accuracy Service (HAS) and the Full Operational Capability Search and Rescue (SAR) Service Performance Reports for Q1 2025 have been published.

The Reports for Q1 2025 are available in the Performance Reports section, providing the status of the Galileo constellation and the achieved performance.

The reports provide users with the latest performance statistics on the Galileo OS, HAS and SAR/Galileo, measured against their Minimum Performance Levels (MPLs) as outlined in their respective Galileo Service Definition Documents.

The quarterly reports include information on such parameters as:

  • Galileo OS: Ranging Performance, Galileo UTC and Galileo-GPS Time Offset (GGTO) Dissemination and Determination Performance, Galileo Positioning Performance, the Timely Publication of NAGUs (Notice Advisory to Galileo Users).
  • Galileo HAS: Accuracy and Availability of the HAS corrections, and Service Coverage.
  • SAR/Galileo Full Operational Services: Forward Link Service, Detection and Location Performance, Return Link Service, Return Link Message (RLM) Delivery Latency and Reception Probability Performance, European MEOLUT and Space Segment Availability Performance.

Highlights from Q1 2025

During the reporting period, the measured Galileo OS, HAS and SAR performance figures exceeded their MPL thresholds, specified in the OS-SDD, HAS-SDD and SAR-SDD.
Key highlights:

Open Service:

  • Galileo Open Service Ranging Performance:
    • Per-slot Availability of Healthy Signal in Space for each Galileo operational satellite: average monthly values at least equal to 99.61% for every Single-Frequency and Dual-Frequency combination, above the MPL threshold (92%).
    • Galileo Signal in Space Ranging Accuracy for individual space vehicles: monthly accuracy between 0.15 [m] and 0.49 [m] for Dual-Frequency combinations. For Single-Frequency observables, the accuracy was in the range of 0.27 [m] to 1.63 [m]. Compliance with the MPL target (threshold is 7 [m]) was achieved with considerable margin by all the Galileo satellites.
    • Worst-satellite ranging accuracy, Global Average at 99.9% confidence level: values between 0.32 [m] to 0.91 [m] on Dual-Frequency combinations. For Single Frequency observables, values are between 0.54 [m] and 2.42 [m].
    • Average Ranging Accuracy at constellation level (over “All Satellites”): figures “per signal” better than or equal to 0.19 [m] for Dual-Frequency signal combinations 0.75 [m] for Single-Frequency signals. Achieved results at least one order of magnitude better than the MPL threshold (2 [m]).
  • Galileo UTC and GGTO Dissemination and Determination Performance: achieved good values for the UTC Time Dissemination Service Accuracy, the UTC Frequency Dissemination Service Accuracy, and the GGTO Determination Accuracy.
  • Galileo Positioning Performance: met both Position Dilution of Precision (PDOP) and Positioning Service availability target values by a significant margin.
  • Timely Publication of NAGUs for the OS: issued 11 NAGUs during the quarter, meeting timeliness requirements (target to issue a NAGU at least 48 hours before the start of a scheduled event, as well as not more than 30 hours after the occurrence of an unscheduled one).

High Accuracy Service:

  • Accuracy of the HAS Corrections provided via terrestrial dissemination (IDD) and via SIS for:
    • Orbit was better than or equal to 0.18 [m] for Galileo and 0.21 [m] for GPS satisfying the MPL thresholds (0.20 [m] for Galileo and 0.33 [m] for GPS).
    • Clock offset was equal to 0.09 [m] for Galileo and 0.15 [m] for GPS in compliance with the MPL targets (0.12 [m] for Galileo and 0.15 [m] for GPS).
    • Code bias was better than or equal to 0.26 [m] for Galileo and 0.32 [m] for GPS. Compliance with the MPL target (threshold is 50 [m] for both Galileo and GPS) was achieved with considerable margins.
  • Availability of the HAS Corrections provided via terrestrial dissemination and SIS exceeded 94.38% for Galileo-only corrections (above defined MPL target of 87 %) and not lower than 98.26% for Galileo + GPS corrections.
  • Service coverage: Service coverage was 100% over the whole reporting period considering HAS corrections dissemination both via SIS and using IDD.
  • Timely publication of NAGUs for the HAS: during the quarter, 2 NAGUs were issued.

Full Operational SAR/Galileo Service:

  • Availability of SAR/Galileo:
    • Forward Link Service: achieved 99% MPL target throughout the reporting period, with a yearly normalised value of 99.92%.
    • MEOLUT facilities in “Nominal” mode: the availability figures for all EU MEOLUT facilities met the required MPL target in “Nominal” mode achieving values above or equal to 98.2% (MPL threshold being 95%).
    • Return Link Service: was above 99.81% every month of the reported period (MPL set to 95%).
    • SAR Transponders: the Availability of the SART achieved excellent levels of performance: short-term (monthly) figures achieved 100% for all the other transponders, over the whole quarter. Due to the normalisation over 12 months foreseen by MPL definition, the minimum value results to be 98.1%, being attributed to GSAT0213, worst satellite over the whole quarter; this is however in line with the commitment, given that MPL target is set to 95%.
  • Performance of:
    • Detection Service: is in line with requirements in the ECA (European SAR/Galileo Coverage Area) (see section 3.1 Figure 3 in the SAR SDD), with monthly values of a valid message detection probability after a single transmitted burst equal to 100% for all the REFBEs, while the target is 99%. On the other hand, within IOCA (Indian Ocean Coverage Area) the MPL measurement slightly drops below the common target, being equal to 98.5% at Kerguelen in January, 98.6% at both La Réunion and Kerguelen in February, 98.8% at La Réunion in March.
    • Location Probability: meets the MPL in both the ECA and the IOCA (see section 3.1 Figures 3 and 4 respectively in the SAR SDD): above or equal to 95.6% for single-burst for all REFBEs, where the MPL target is 90%, and above or equal to 99.3% after twelve transmitted bursts (multi-burst) for all REFBEs, where the MPL target is 98%;
    • Location Accuracy within 5 km: exceeds the MPL in the ECA, with monthly values above or equal to 95.0% for single-burst and above or equal to 99.1% for multi-burst transmission, while the MPL targets are respectively 90% and 95%. Same targets apply for the IOCA, where measured values for single-burst are comprised between 86.7% (La Réunion, January) and 89.7% (Kerguelen, March) in single-burst, thus not reaching the target over the whole reporting period. In the case of multi-burst, the IOCA performances are met, being in the range from 95.9% (Kerguelen, January) to 97.2% (Kerguelen, March).
  • Return Link Service:
    • Delivery Latency within 15 minutes: above or equal to 99.68% and an average of 99.81%, for an MPL target set to 99%.
    • Reception Probability: above 99.66% in every month of the reported period and an average value of 99.78% (MPL set to 99%).

For the most up-to-date information on the Galileo system and constellation, visit the European Union GSC website, in particular, the Galileo constellation status section.
If you wish to receive NAGUs and notifications about new Galileo publications, please register on the GSC web portal and subscribe to our newsletters.

About Galileo

Galileo, the EU´s Global Navigation Satellite System (GNSS), provides improved navigation, positioning and timing information. More than 4 billion users are already benefitting from Galileo.


The Galileo Programme is owned by the EU. The European Commission, as the Programme Manager, oversees the implementation of all activities. EUSPA is responsible for the operational management of the services, ensuring that they are delivered with the defined performance and without interruption. Galileo's system design and system evolution are entrusted by EUSPA to ESA .

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