Crj-200 captain reported being dispatched with the aircraft's GPS inoperative and the FMS intermitte...

Attributes
ACN	1415470
Time
Date	201701
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Visual Approach
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter CFTT / CFIT

Narrative:

While on visual approach to we were maneuvering toward the runway when we received a terrain warning from the ground proximity warning system (GPWS). The aircraft's GPS was inoperative and the FMS was intermittently flashing FMS dead reckoning mode (dr) and terrain not available. We appeared to be above the terrain but elected to comply with the warning and climb. Wen continued the approach without further event.the reported ceiling was 045 ovc with weather clearing from the area. The GPS being deferred left us not trusting the FMS and desiring to get on the localizer as soon as possible turning toward the airport which brought us closer to higher terrain. I will be less likely to accept a visual approach into ZZZ at night until I'm sure that I'm over the ocean.

Original NASA ASRS Text

Title: CRJ-200 Captain reported being dispatched with the aircraft's GPS INOP and the FMS intermittently flashing FMS DR and Terrain not available. During a night visual approach a terrain warning is annunciated and the Captain elected to comply with the warning.

Narrative: While on visual approach to we were maneuvering toward the runway when we received a terrain warning from the Ground proximity Warning System (GPWS). The aircraft's GPS was INOP and the FMS was intermittently flashing FMS Dead Reckoning Mode (DR) and Terrain not available. We appeared to be above the terrain but elected to comply with the warning and climb. Wen continued the approach without further event.The reported ceiling was 045 OVC with weather clearing from the area. The GPS being deferred left us not trusting the FMS and desiring to get on the localizer as soon as possible turning toward the airport which brought us closer to higher terrain. I will be less likely to accept a visual approach into ZZZ at night until I'm sure that I'm over the Ocean.

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 captain reported being dispatched with the aircraft's GPS inoperative and the FMS intermittently flashing FMS dr and terrain not available. During a night visual approach a terrain warning is annunciated and the captain elected to comply with the warning.