What was found
FLT 26 - HNL - NAV UNREADABLE, BOTH HSI AND RMI HEADINGS WERE DIFFERENT IN NAV POSITION UP TO 50 DEGREES AT ONE POINT. HSI COURSE INDICATORS DID NOT AGREE WITH LEGS PAGE COURSE. NR 1 WENT TO VERIFY POSITION, NR 2 WENT TO DR. POSITION CHECKED OK FOR BOTH. A/C RETURNED TO HNL, WHERE AN UNEVENTFUL LANDING WAS MADE. (M)