On 2025/01/08 Jason-3 was moved on a tandem orbit with Sentinel-6A. It remained on this orbit for nearly 4 months and was then moved on a new long repeat orbit as done in 2017 for Jason-2. The move is designed to safeguard the orbit for Sentinel-6A and its planned successor, Sentinel-6B, planned for launch end 2025.

During the tandem phase, Jason-3 and Sentinel-6A followed exactly the same ground-track position, with few second delay. During this phase, the L3 processing was inhibited. The L3 Jason-3 processing restarted in June 2025 when the satellite is in its interleaved long repeat orbit. These measurements are delivered in the new “j3g” dataset. The measurement errors of Jason-3 on its new orbit are estimated to be of the same order as on its historical track.