Narrative:

I misread an estimate of the navigation display. I.e., estimating waypoint #5 (I don't remember the exact waypoints involved) I read the ETA shown for waypoint #6 which was XY55, the waypoint #5 ETA was shown as XX59. Hnl radio selcaled me back and asked if it was :55 or :59 (not the hour in question but the mins?) anyway, I think I reiterated the 55. We actually crossed the waypoint #5 at XY00Z which was either 2 mins or 1 hour and 2 min off. Commercial radio or center didn't raise any questions or act like anything was amiss so I think they had things figured out. The whole thing was so subtle that I didn't realize the problem. The other 2 crew members weren't aware of the situation because I was using my headset, not the speakers and I didn't really start working this out until after the flight was over.

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Original NASA ASRS Text

Title: NAV ERROR.

Narrative: I MISREAD AN ESTIMATE OF THE NAV DISPLAY. I.E., ESTIMATING WAYPOINT #5 (I DON'T REMEMBER THE EXACT WAYPOINTS INVOLVED) I READ THE ETA SHOWN FOR WAYPOINT #6 WHICH WAS XY55, THE WAYPOINT #5 ETA WAS SHOWN AS XX59. HNL RADIO SELCALED ME BACK AND ASKED IF IT WAS :55 OR :59 (NOT THE HR IN QUESTION BUT THE MINS?) ANYWAY, I THINK I REITERATED THE 55. WE ACTUALLY CROSSED THE WAYPOINT #5 AT XY00Z WHICH WAS EITHER 2 MINS OR 1 HR AND 2 MIN OFF. COMMERCIAL RADIO OR CTR DIDN'T RAISE ANY QUESTIONS OR ACT LIKE ANYTHING WAS AMISS SO I THINK THEY HAD THINGS FIGURED OUT. THE WHOLE THING WAS SO SUBTLE THAT I DIDN'T REALIZE THE PROBLEM. THE OTHER 2 CREW MEMBERS WEREN'T AWARE OF THE SITUATION BECAUSE I WAS USING MY HEADSET, NOT THE SPEAKERS AND I DIDN'T REALLY START WORKING THIS OUT UNTIL AFTER THE FLT WAS OVER.

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.