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 Q1 2026 have been published.
The Reports for January, February and March 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 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 Q1 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 for each Galileo operational satellite: average monthly values at least equal to 98.31% 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 0.57 [m] for Dual-Frequency combinations. For Single-Frequency observables, the accuracy was in the range of 0.27 [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 0.45 [m] to 1.66 [m] on Dual-Frequency combinations. For Single Frequency observables, values are between 0.76 [m] and 2.50 [m].
- Average Ranging Accuracy at constellation level (over “All Satellites”): figures “per signal” better than or equal to 0.29 [m] for Dual-Frequency signal combinations and 0.53 [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 15 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 0.19 [m] for Galileo and 0.20 [m] for GPS satisfying the MPL threshold (0.20 [m] for Galileo and 0.33 [m] for GPS).
Clock offset was equal to 0.08 [m] for Galileo in compliance with the MPL target (0.12 [m] for Galileo) and 0.156 [m] for GPS while the MPL target is at 0.15 m. The degraded accuracy for the GPS clock corrections was mainly caused by a combination of the high solar activity and internal network connectivity issues resulting in reduced availability of GPS measurements. The performance was recovered during the following months of the quarter, and it is expected to be met in the future.
- Code bias was better than or equal to 0.20 [m] for Galileo and 0.32 [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 88.82% for Galileo-only corrections (above defined MPL target of 87 %) and not lower than 97.99% 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:
- 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 GST-GPS 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.
- ADKD0 for the Galileo I/NAV Orbit and Clock correction data:
Availability of OS-equivalent OSNMA navigation solution: every month of the reported period, the 95% MPL target was achieved.
Timely publication of OSNMA NAGUs: 5 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 value of 99.94% in the ECA (European SAR/Galileo Coverage Area) (see section 3.1 Figure 3 in the SAR SDD) and above 98.33% for IOCA.
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 98.30% (MPL threshold being 95%).
Return Link Service: was above 99.35% every month of the reported period (MPL set to 95%).
SAR Repeaters (SARR) for the Forward Link Service: the Availability of the SARR achieved excellent levels of performance: short-term (monthly) figures achieved 100% for all the other transponders, over the whole quarter except for the repeater of satellites GSAT0232 (E16) achieving a value of 4.20% for the month of January, when it was manoeuvred to occupy the orbital slot of GSAT0205 (E24) within the nominal Galileo constellation. The Galileo SARR comprises transparent bent pipe type SAR Transponders and SAR receiving and transmitting antennas.
- Performance of:
Detection Service for the Forward Link Service: met the common MPL target, set at 99%, for ECA and IOCA (see section 3.1 Figures 3 and 4 respectively in the SAR SDD): with monthly values of a valid message detection probability after a single transmitted burst equal to 99.80% for all ECA REFBEs, and at least to 99.10% for the IOCA REFBEs.
Location Probability: met 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 99.10% in the ECA and 94.17% for single-burst for all REFBEs, where the MPL target is 90%, and equal to 99.80% for 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 97.2% for single-burst and above or equal to 99.57% for multi-burst transmission, while the MPL targets are respectively 90% and 95%. Same targets apply for the IOCA, where measured value for single burst marginally did not fully meet the MPL target in January for La Reunion, having achieved a value of 85.9%, and in January, February and March for Kerguelen, having achieved a value of 86.80%, 87.20%, 88.71%, respectively. The MPL target was met for multi-burst, except in January for both La Réunion and Kerguelen with an achieved value of 94.50% and 94.70% respectively.
- Return Link Service:
Delivery Latency within 15 minutes: minimal value above or equal to 99.78% and an average of 99.84%, for an MPL target set to 99%.
Reception Probability: above 99.82% in every month of the reported period and an average value of 99.93% (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.
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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 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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