MD80 FLT CREW REPORTS GPS SIGNAL LOSS NEAR KROST AS NOTAMED AND THE INABILITY OF THE NON DME/DME ACFT TO NAVIGATE SUCCESSFULLY DURING THE OUTAGE.

Narrative

SAW ON PAPERWORK THE NOTAM FOR A POSSIBLE GPS OUTAGE NEAR THE TONOPAH TEST RANGE. KNEW THAT WE WERE FILED N OF THAT (BCE-ILC-OAL-INYOE-TROSE-MOD) AND DID NOT SIT DOWN AND DETERMINE HOW FAR N (HAD A 25 MIN TURN WITH A PLANE CHANGE AND CONCOURSE CHANGE). APCHING ILC; WE WERE GIVEN ILC-KROST-OAL AS FILED FOR MIL AIRSPACE. APCHING KROST; THE FMS WENT INTO DEAD RECKONING WITH NO SATELLITE SIGNALS BEING RECEIVED AT ALL. WE DIALED IN OAL AND STARTED TRACKING THE VOR. AT THIS TIME WE ENTERED THE LAT/LONGITUDE FOR THE OUTAGE CTR AND SAW THAT WE WERE ABOUT 70 MI AWAY. MY GUESS IS THE OUTAGE RADIUS AT OUR ALT WAS ABOUT 150 MI. AFTER INFORMING ZLC THAT WE HAD LOST OUR GPS SIGNAL; WE WERE SWITCHED TO ZOA WHO THEN CLRED US DIRECT MOD. DIALED THAT IN AND STARTED RECEIVING A WEAK SIGNAL AT ABOUT 150 DME. THE RADIAL SHOWED US TRACKING S OF COURSE; SO I ADDED IN ADDITIONAL R CORRECTION. AT ABOUT 110 DME THE NEEDLE SHOWED CTRED; AND THE SATELLITES CAME BACK ONLINE; SHOWING US WELL N OF THE DIRECT LINE TO MOD. AT THAT SAME MOMENT; OAK ASKED WHERE WE WERE TRACKING AND WE ONCE AGAIN STATED THAT THE GPS SIGNAL HAD BEEN LOST BUT HAD NOW BEEN REACQUIRED AND WE WERE GOING DIRECT MOD. THESE FMS ACFT WITHOUT DME/DME UPDATE CAPABILITY SHOULD NOT BE SENT ON THIS ROUTING IN THE EVENING WHILE THE MIL IS PLAYING WITH THE SATELLITE SIGNAL! THE DR ABILITY OF THIS BOX IS NON-EXISTENT. THE VOR SIGNALS ARE NOT GOOD ENOUGH AROUND THE MOUNTAINS TO BE GIVEN OFF-COURSE ROUTINGS IN THIS SITUATION.