The Galileo Open Service (OS), the High Accuracy Service (HAS), the Open Service Navigation Message Authentication (OSNMA) and the Search and Rescue (SAR) Service Performance Reports for Q2 2026 have been published.
The Reports for April, May and June 2026 are available in the Performance Reports section, providing the status of the Galileo constellation and the achieved performance.
The reports present the latest performance statistics on the Galileo OS, HAS, OSNMA and SAR/Galileo, measured against their Minimum Performance Levels (MPLs) as outlined in their respective 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, and the Timely Publication of NAGUs (Notice Advisory to Galileo Users).
Galileo HAS: Accuracy and Availability of the HAS corrections, and Service Coverage.
Galileo OSNMA: MAC Availability, Availability of OS-equivalent OSNMA navigation solution, and the Timely publication of OSNMA NAGUs.
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 Q2 2026
During the reporting period, the measured Galileo OS, HAS, OSNMA and SAR performance figures exceeded their MPL thresholds, specified in the OS-SDD, OSNMA-SDD, SAR-SDD and HAS-SDD.
Key highlights:
Open Service:
Galileo OS Ranging Performance:
Per-slot Availability of Healthy Signal in Space (SiS) for each Galileo operational satellite: average monthly values at least equal to 98.29% 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 0.14 [m] and 0.55 [m] for Dual-Frequency combinations. For Single-Frequency observables, the accuracy was in the range of 0.23 [m] to 1.02 [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 0.44 [m] to 1.61 [m] on Dual-Frequency combinations. For Single Frequency observables, values are between 0.53 [m] and 1.85 [m].
Average Ranging Accuracy at constellation level (over “All Satellites”): figures “per signal” better than or equal to 0.27 [m] for Dual-Frequency signal combinations and 0.40 [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 14 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 0.16 [m] for Galileo and 0.22 [m] for GPS satisfying the MPL threshold (0.20 [m] for Galileo and 0.33 [m] for GPS).
Clock offset was equal to 0.07 [m] for Galileo and 0.12 [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 0.17 [m] for Galileo and 0.25 [m] for GPS. Compliance with the MPL target (threshold is 0.50 [m] for both Galileo and GPS) was achieved with considerable margins.
Availability of the HAS Corrections provided via terrestrial dissemination and SIS exceeded 89.76% for Galileo-only corrections (above defined MPL target of 87 %) and not lower than 97.94% for Galileo + GPS corrections.
Service coverage: Service coverage reached the target availability over the whole reporting period considering HAS corrections dissemination both via SIS and using IDD (target is 87% in the case of Galileo only users, while 95% for Galileo and GPS ones).
Timely publication of NAGUs for the HAS: during the quarter, 3 NAGUs were issued.
Open Service Navigation Message Authentication (OSNMA):
MAC Availability:
ADKD0 for the Galileo I/NAV Orbit and Clock correction data:
For at least 4 Galileo nominal or auxiliary satellites in view within a period of 30 seconds: achieved 95% MPL target throughout the reporting period.
For all Galileo nominal or auxiliary satellites in view within a period of 600 seconds: achieved 80% MPL target throughout the reporting period.
ADKD12 for the Galileo I/NAV data:
For at least 4 Galileo nominal or auxiliary satellites in view within a period of 240 seconds: achieved 95% MPL target throughout the reporting period.
ADKD4 for the Galileo GST-UTC and GGTO parameters:
For at least 1 Galileo nominal or auxiliary satellites in view within a period of 60 seconds: achieved 97% MPL target throughout the reporting period.
Availability of OS-equivalent OSNMA navigation solution: every month of the reported period, the 95% MPL target was achieved.
Timely publication of OSNMA NAGUs: 2 NAGUs were issued during the quarter.
Full Operational SAR/Galileo Service:
- Availability of SAR/Galileo:
Forward Link Service: achieved 99% MPL target throughout the reporting period, with a yearly normalised monthly value of 99.96% in the ECA (European SAR/Galileo Coverage Area), and above 97.42% for IOCA (see section 3.1 Figures 3 and 4 respectively in the SAR SDD).
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 97.60% (MPL threshold being 95%).
Return Link Service: annually normalised value was above or equal to 99.41% (MPL set to 95%).
SAR Repeaters (SARR) for the Forward Link Service: the Availability of the SARR achieved excellent levels of performance for all the constellation: short-term (monthly) figures achieved 100% for all the other transponders, over the whole quarter.
- Performance of:
Detection Service for the Forward Link Service: met the common MPL target, set at 99%, for ECA (see section 3.1 Figure 3 in the SAR SDD), with monthly values of a valid message detection probability after a single transmitted burst above or equal to 99.97% for all ECA REFBEs. Same targets apply for the IOCA, where measured values did not fully meet the MPL target in June for La Réunion and Kerguelen, having achieved a value of 98.53% and 98.79% respectively.
Location Probability: meets the MPL in both the ECA and the IOCA (see section 3.1 Figures 5 and 6 respectively in the SAR SDD): above or equal to 96.30% for single-burst for all REFBEs, where the MPL target is 90%, and above or equal to 99.90% for multi-burst, where the MPL target is 98%.
Location Accuracy within 5 km: exceeds the MPL in the ECA, with monthly values above or equal to 97.48% for single-burst and above or equal to 99.58% for multi-burst, while the MPL targets are 90% and 95% respectively. Same targets apply for the IOCA, where measured value for single burst did not fully meet the MPL target in May for Kerguelen, having achieved a value of 89.31%, while the MPL target was met in April and June. The MPL target for multi-burst was met, with monthly achieved values above or equal to 96.93%.
Return Link Service:
Delivery Latency within 15 minutes: annually normalised value above or equal to 99.87% and an average of 99.95%, for an MPL target set to 99%.
Reception Probability: above 99.90% in every month of the reported period and an average value of 99.97% (MPL set to 99%).
For the most up-to-date information on the Galileo system and constellation, visit the European Union GSC website the Galileo constellation status section.
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About Galileo
Galileo, the EU´s Global Navigation Satellite System (GNSS), provides improved navigation, positioning and timing information. More than 4.5 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 their availability, continuity and performance, and for the procurement of launch services required for the deployment and replenishment of the constellation. Galileo's system design and system evolution are entrusted by EUSPA to ESA.
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