Crj-200 captain experiences a GPS malfunction prior to taxi which is reset by the first officer. Aft...

Narrative:

Aircraft was serviced by maintenance before the flight and several electrical resets were performed. During preflight; first officer noticed the position was in error; and reset it. No other anomalies were detected. After takeoff; we noticed that the FMS seemed to have jumped and gave us a fairly straight out turn. But we noticed it didn't seem correct based on the RNAV departure. ATC queried us and at the same time we noticed the discrepancy and we informed them of a GPS failure and requested a heading; so we could troubleshoot the problem to try and fix it. Shortly thereafter we received a message FMS dr more than 5 minutes. We determined at this point the GPS off substantially and flew the rest of the way using vors and green needles. We tried several times to sync the GPS; but the position would not hold. We contacted the company to let them know of the situation via ACARS. No other anomalies occurred. We don't believe anything could have prevented this from our standpoint. With a GPS failure of this nature; it was not recognizable until we noticed it didn't seem right as well as ATC discovering the issue.

Original NASA ASRS Text

Title: CRJ-200 Captain experiences a GPS malfunction prior to taxi which is reset by the First Officer. After takeoff the crew and ATC both note the aircraft was not following the RNAV departure. VOR navigation is used to continue to destination.

Narrative: Aircraft was serviced by Maintenance before the flight and several electrical resets were performed. During preflight; First Officer noticed the position was in error; and reset it. No other anomalies were detected. After takeoff; we noticed that the FMS seemed to have jumped and gave us a fairly straight out turn. But we noticed it didn't seem correct based on the RNAV departure. ATC queried us and at the same time we noticed the discrepancy and we informed them of a GPS failure and requested a heading; so we could troubleshoot the problem to try and fix it. Shortly thereafter we received a message FMS DR more than 5 minutes. We determined at this point the GPS off substantially and flew the rest of the way using VORs and green needles. We tried several times to sync the GPS; but the position would not hold. We contacted the Company to let them know of the situation via ACARS. No other anomalies occurred. We don't believe anything could have prevented this from our standpoint. With a GPS failure of this nature; it was not recognizable until we noticed it didn't seem right as well as ATC discovering the issue.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1128941
Time
Date	201311
Local Time Of Day	0601-1200
Place
Locale Reference	CVG.TRACON
State Reference	KY
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

Crj-200 captain experiences a GPS malfunction prior to taxi which is reset by the first officer. After takeoff the crew and ATC both note the aircraft was not following the RNAV departure. VOR navigation is used to continue to destination.