“At around 5 AM Pacific Time (1 PM GMT) today (March 7th) the GPS satellites started transmitting inconsistent health information causing Swift Navigation receivers to exclude measurements from any satellites supporting the L2C signal. This has resulted in degraded or unavailable position information and decreased ability to achieve an RTK Fixed solution.”

We kept an eye on the data coming in – as it is not easy to go to Iceland and update the firmware..

This plot shows how the gps behaviour changed after the march 7th announcement. Without knowing this we could have assumed it was caused by something like wet snow cover.