Narrative:

While preparing for departure the captain loaded incorrect position coordinates in the IRS position. Instead of a correct position of approximately north 50 degree 15 mins, east 00 degree 01 mins, he loaded north 50 degree 15 mins west oo degree 01 mins. Contributing factors. Rushing to beat a noise curfew. Short layover. Lack of crew coordination and xchk. This resulted in a navigation map shift of approximately 30 mi. The problem was discovered on initial departure when radar told us we weren't proceeding on the proper course. The problem was discovered quickly and no conflict occurred. We switched to manual navigation. However, we couldn't continue our ocean crossing and diverted to shannon, ireland, where we made an overweight landing. Human performance considerations. Although the captain was supposed to be giving me a navigation check he rapidly and west/O asking for verification programmed the computers himself. We had sufficient time to do the job right but didn't take it. I should have crosschecked our position but didn't. (It isn't in our navigation checklist to do so).

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Original NASA ASRS Text

Title: ACR WDB CKP LOADED THE WRONG POSITION INTO THE IRS NAVIGATION SYSTEM AND THE ACFT HAD TO DIVERT TO AN ALTERNATE TO UPDATE THE SYSTEM BEFORE STARTING AN EXTENDED OVERWATER FLT.

Narrative: WHILE PREPARING FOR DEP THE CAPT LOADED INCORRECT POS COORDINATES IN THE IRS POS. INSTEAD OF A CORRECT POS OF APPROX N 50 DEG 15 MINS, E 00 DEG 01 MINS, HE LOADED N 50 DEG 15 MINS W OO DEG 01 MINS. CONTRIBUTING FACTORS. RUSHING TO BEAT A NOISE CURFEW. SHORT LAYOVER. LACK OF CREW COORD AND XCHK. THIS RESULTED IN A NAV MAP SHIFT OF APPROX 30 MI. THE PROB WAS DISCOVERED ON INITIAL DEP WHEN RADAR TOLD US WE WEREN'T PROCEEDING ON THE PROPER COURSE. THE PROB WAS DISCOVERED QUICKLY AND NO CONFLICT OCCURRED. WE SWITCHED TO MANUAL NAV. HOWEVER, WE COULDN'T CONTINUE OUR OCEAN XING AND DIVERTED TO SHANNON, IRELAND, WHERE WE MADE AN OVERWEIGHT LNDG. HUMAN PERFORMANCE CONSIDERATIONS. ALTHOUGH THE CAPT WAS SUPPOSED TO BE GIVING ME A NAV CHK HE RAPIDLY AND W/O ASKING FOR VERIFICATION PROGRAMMED THE COMPUTERS HIMSELF. WE HAD SUFFICIENT TIME TO DO THE JOB RIGHT BUT DIDN'T TAKE IT. I SHOULD HAVE XCHKED OUR POS BUT DIDN'T. (IT ISN'T IN OUR NAV CHKLIST TO DO SO).

Data retrieved from NASA's ASRS site as of July 2007 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.