Crj-200 flight crew reported a track deviation occurred when they experienced an apparent GPS malfun...

Attributes
ACN	1448910
Time
Date	201705
Local Time Of Day	1201-1800
Place
Locale Reference	DCA.Airport
State Reference	DC
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	STAR CAPSS 2
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

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.

Original NASA ASRS Text

Title: CRJ-200 flight crew reported a track deviation occurred when they experienced an apparent GPS malfunction.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Crj-200 flight crew reported a track deviation occurred when they experienced an apparent GPS malfunction.