Crj-200 first officer reported navigation problems associated FMS and GPS related issues.

Attributes
ACN	1653658
Time
Date	201906
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
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	Cruise
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

While in cruise; received several messages from ATC that we were slightly off course. It appeared our FMS and GPS were not giving correct position information; despite following the procedure in the foib regarding the adsb out of service. We eventually had to request radar vectors until we could confirm green needle backup and continue our course via green needles. Flight continued with no further problems. Discussed the issue with maintenance and they said to write up the FMS and GPS. FMS and GPS not giving correct location data to pilots. Request vectors earlier before problem continues to get worse.

Original NASA ASRS Text

Title: CRJ-200 First Officer reported navigation problems associated FMS and GPS related issues.

Narrative: While in cruise; received several messages from ATC that we were slightly off course. It appeared our FMS and GPS were not giving correct position information; despite following the procedure in the FOIB regarding the ADSB out of service. We eventually had to request radar vectors until we could confirm green needle backup and continue our course via green needles. Flight continued with no further problems. Discussed the issue with maintenance and they said to write up the FMS and GPS. FMS and GPS not giving correct location data to pilots. Request vectors earlier before problem continues to get worse.

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.