Small Transport
Flight Crew Air Transport Pilot (ATP)
Troubleshooting
Aircraft Equipment Problem Critical; Deviation - Track / Heading All Types
Air Traffic Control Provided Assistance; Flight Crew Diverted
ATC Equipment / Nav Facility / Buildings; Aircraft
On a flight at FL240 we diverted to ZZZ due to multiple and continuing GPS failures. The GTN GPS first failed without warning; causing the autopilot to enter roll mode and causing the MFD map and Weather functions to fail. This happened just prior to crossing BAF VOR and starting the HYPER7 arrival. The GPS flashed a warning that it had lost all satellites and was in DR mode. We asked BOS Center for an initial heading while we worked on the problem. After about 3 minutes the GPS regained its position. We informed BOS Center that we could continue; they cleared us direct a fix on the HYPER7. After a few minutes the GPS again lost all satellites and the associated failures occurred again. We waited a minute to see if the GPS would regain its position; it did not. Due to restricted airspace around and near IAD and several storms and reported low IFR conditions we decided to divert to ZZZ which we had just passed and was good VFR. We informed BOS Center and we diverted and landed uneventfully at ZZZ.
Fractional aircraft Captain reported an issue with GPS navigation which resulted in significant effect on aircraft navigation capability. Aircraft diverted to an enroute airfield.