Air carrier first officer reported loss of GPS/FMS navigation capability during the arrival.

Attributes
ACN	1728896
Time
Date	202002
Local Time Of Day	0601-1200
Place
Locale Reference	ORD.Airport
State Reference	IL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Medium Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR FYTTE FIVE
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

Coming down the FYTTE5 the FMS lost GPS causing the aircraft to continue straight during a turn on the arrival. We noticed the issue and contacted ATC and were then given headings to join ILS runway 27R. Not much we could have done we saw it as soon as it didn't sequence and contacted ATC to let them know we just experienced a FMS/GPS failure. The newest revision of software we think might have affected the sudden drop in GPS calculation causing us to go off course. We resent the position and then all matched for the points on the approach backed up with the DME for the approach.

Original NASA ASRS Text

Title: Air carrier First Officer reported loss of GPS/FMS navigation capability during the arrival.

Narrative: Coming down the FYTTE5 the FMS lost GPS causing the aircraft to continue straight during a turn on the arrival. We noticed the issue and contacted ATC and were then given headings to join ILS Runway 27R. Not much we could have done we saw it as soon as it didn't sequence and contacted ATC to let them know we just experienced a FMS/GPS failure. The newest revision of software we think might have affected the sudden drop in GPS calculation causing us to go off course. We resent the position and then all matched for the points on the approach backed up with the DME for the approach.

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.