Regional Jet 200 ER/LR (CRJ200)
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued New Clearance; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification
Aircraft
On arrival into DCA on the CAPSS2 the FMS was showing us between the MOEJO and JILES at 6000 ft as ATC had assigned us 6000 ft. We received multiple FMS messages including 'VOR-GPS disagree;' 'FMS DR;' messages and a TERRAIN NOT AVAIL Status Message and after looking outside we realized we were not in the place our FMS position was telling us as we were closer to DCA airport than our FMS was showing. We concluded we had a GPS issue or FMS issue and we immediately informed ATC of the malfunction and requested vectors for the rest of the arrival into DCA. ATC never questioned our location and no separation issues occurred.
[Report narrative contained no additional information.]
CRJ-200 flight crew reported a track deviation occurred when they experienced an apparent GPS malfunction.