Narrative:

On localizer approach ege. We followed all procedures appropriately. Non-GPS aircraft. Turning final with localizer captured; we noticed the seemingly usual map shift common in ege with non-GPS aircraft. I've been going in there all winter. It's become common. First officer and I discussed possibility of GPS warning and I reiterated my command that should we receive such a warning on final; since it was at night; we would go around. As we approached 7000 ft or so; we got a caution and; as we continued to try and maneuver on final; we received a warning. We went around and went to ZZZ1. This approach has become a danger in non-GPS aircraft. I am not a mission hacker. I go by the book. In my opinion; this approach should be flown by GPS aircraft only.

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Original NASA ASRS Text

Title: FOLLOWING A VISIBLE MAP SHIFT; NON GPS EQUIPPED ACFT RECEIVES GPWS WARNING ON APCH TO EGE IN MOUNTAINOUS TERRAIN. EXECUTES GAR AND DIVERTS TO ANOTHER ARPT.

Narrative: ON LOC APCH EGE. WE FOLLOWED ALL PROCS APPROPRIATELY. NON-GPS ACFT. TURNING FINAL WITH LOC CAPTURED; WE NOTICED THE SEEMINGLY USUAL MAP SHIFT COMMON IN EGE WITH NON-GPS ACFT. I'VE BEEN GOING IN THERE ALL WINTER. IT'S BECOME COMMON. FO AND I DISCUSSED POSSIBILITY OF GPS WARNING AND I REITERATED MY COMMAND THAT SHOULD WE RECEIVE SUCH A WARNING ON FINAL; SINCE IT WAS AT NIGHT; WE WOULD GO AROUND. AS WE APCHED 7000 FT OR SO; WE GOT A CAUTION AND; AS WE CONTINUED TO TRY AND MANEUVER ON FINAL; WE RECEIVED A WARNING. WE WENT AROUND AND WENT TO ZZZ1. THIS APCH HAS BECOME A DANGER IN NON-GPS ACFT. I AM NOT A MISSION HACKER. I GO BY THE BOOK. IN MY OPINION; THIS APCH SHOULD BE FLOWN BY GPS ACFT ONLY.

Data retrieved from NASA's ASRS site as of May 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.