Flight Crew Private; Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Commercial
Workload; Time Pressure; Communication Breakdown
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural MEL / CDL
Human Factors; Aircraft; ATC Equipment / Nav Facility / Buildings
System wide ADS-B and GPS failure. We noticed the ADS-B failure; which was not needed for flight; but I didn't notice that GPS was unavailable until we were taking off. The Captain then said that we didn't need it; and as we were taking off I didn't want to argue. I later looked up the MEL and learned that we did need it; Captain still doesn't realize.System wide GPS failure today; Dispatch only notified us that of the ADS-B failure which the MEL allows; but we didn't realize that the whole GPS system was down as well. By the time I realized; we were released for departure and on the runway; and the Captain said it was fine; and I thought to trust his knowledge. On the ground; I looked it up and realized we were in the wrong.If we were grounded; it would have been nice for Dispatch to tell us; as it was a system wide thing.
CRJ-200 Non Flying Pilot reported a system wide GPS and ADS-B failure.