Navigation error. - NASA ASRS

Attributes
ACN	206319
Time
Date	199203
Day	Sun
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : hnl
State Reference	HI
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zoa tower : buf
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : pacific
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 26000
ASRS Report	206319
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance non adherence : far other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

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.

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.