On April 6th the GPS week number will roll over from 1023 back to zero. This is because GPS uses a 10-bit field to encode the week number in each time message, which has a maximum value of 1024. Once this limit is reached, the receiver resets the week number back to zero and starts counting up again. Week zero was in August 1999, and will become April 7th-13th 2019.

You can check your receiver will handle this rollover by using a LabSat 3

If you have a LabSat you can download the rollover test scenario by clicking here >

Note: Multi-band receivers accepting modern GPS signals (L2C, L5) use a 13-bit week number for the GPS Week, you can test for this using a scenario generated using LabSat’s new SatGen v3 WideBand simulation software.