B777 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 127; Flight Crew Total 4521; Flight Crew Type 1146
Aircraft Equipment Problem Less Severe
Flight Crew Became Reoriented; Flight Crew Overcame Equipment Problem; Flight Crew Overrode Automation
Aircraft
Departing ZZZ cleared to 6;000 ft. right turn [Heading] 240 off Runway XX after takeoff cleared direct to ZZZ1 [VOR] executed that on CDU (Control Display Unit); but it did not show on NAV (navigation) display on either Copilot or Captain side. Then issued direct to ZZZ2 [VOR] executed that in CDU still no magenta line for course guidance on either NAV display. CDU was working properly with course and distance. We then noticed we could not select STA WPT ARPT DATA POS from the NAV display selector panel. So we hard tuned the VOR in the CDU and asked for radar vectors to ZZZ2 [VOR] because it was 300 plus miles away. We noticed the lack of GPS on NAV display so I checked GPS in the CDU; it seemed to be working correctly. We informed ATC we were no longer slant Lima equipped. I called Dispatch for help and to get approval from ATC to operate that way. We received a reroute from ATC and Maintenance Control did not see any malfunctions with NAV system. Also our TCAS had malfunctioned during climbout; so we were no longer RVSM capable. We advised ATC of this also and descended. I went through the NAV unreliable checklist that was no help. After about 60 minutes of flight GPS and NAV display control panel started working normally TCAS was still inoperative.
An air carrier Captain reported GPS interference.