All EPN stations submit daily (24 hour) RINEX files with a 30-second sampling interval to a primary and secondary data centre following a well-defined data flow scheme indicated in the Guidelines for EPN Stations and Operational Centres. In order to minimize file size, the RINEX data are Hatanaka compressed before being uploaded hourly or daily to the EPN data centres which are indicated in the table below.
Once a week, the EPN CB informs the EUREF community (through the EUREF mailing list) about missing data files and meta-data inconsistencies (sample email).

• Availability of daily RINEX data (last 4 weeks):
• 90% < station
• 80% < station < 90%
• station < 80%

In addition to the daily data uploads, EPN stations use the same data flow scheme to submit hourly data. The hourly EPN data are mainly used for the determination of zenith total delays in near-real time aiming at improving numerical weather predictions (E-GVAP). For these applications it is crucial that the hourly RINEX observation files are made available to the customer with latencies below 10 minutes.
The EPN CB distributes monthly (through the EUREF mailing list) an overview of the histogram of the minimal latencies of all the EPN stations (sample email).

• Hourly RINEX data submitted with latency below 10 min. (last 4 weeks):
• 90% < station
• 80% < station < 90%
• station < 80%