Not sure if everyone is aware of what’s coming up soon so here’s the link to the NOTAM I received from the FAA. Looks like GPS signal interference down to the surface around Barstow for awhile.
https://www.faasafety.gov/files/notices/2018/Jan/NTC_18-01H_GPS_Flight_Advisory.pdf
https://www.faasafety.gov/files/notices/2018/Jan/NTC_18-01H_GPS_Flight_Advisory.pdf