Septentrio announces today that the mosaic development kit is available for testing and integration. mosaic is Septentrio’s most compact next-generation, high-precision multi-frequency GPS/GNSS module.
The GPS Week Number is broadcast by the satellites in the navigation message and is incremented every week. The GPS week number is modulo 1024, meaning that it will roll over to 0 every 1023 weeks (19.7 years). The next rollover will happen on April 6 2019.
Luckily Septentrio has kindly posted an explanation of this if you are wondering how it works