What was found
(CAN) APPROXIMATELY 6 MILES FINAL THE GPS FLAGGED. CREW CALLED FOR A GO-AROUND. IN THE GO-AROUND THE GPS CAME BACK ON LINE. THE CREW THEN RECEIVED VECTORS FOR NDB APPROACH AND LANDED WITHOUT INCIDENT. IT WAS THOUGHT TO BE A LOSS OF RAIM-RECEIVER AUTONOMOUS INTEGRITY MONITORING. DUE TO THIS THE CREW DECIDED TO CONTINUE SCHEDULED RUN. RAIM WAS SHOWING AVAILABLE PRIOR TO THE APPROACH AND THE GPS WAS USED THROUGHOUT THE REMAINDER OF THE DAY WITH NO ADDITIONAL REPORTED ISSUES.