As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT PILOT HAD LOSS OF ALL GPS NAVIGATION TO THE GARMIN 430W , GARMIN 530W AND THE GARMIN G600 SYS. SYSTEM REVERTED TO DEAD, RECONNING MODE. TROUBLESHOOTING DETERMINED THE GARMIN GA-35 WAAS GPS ANTENNA FOR THE GARMIN 430W FAILED CAUSING AN OSCILLATION WHICH EFFECTED THE OTHER INDEPENDANT GA-35 WAAS GPS ANTENNA FEEDING THE GARMIN 530W/G600 SYS. BOTH WAAS GPS ANTENNA`S TO BE REPLACED WITH NEW.