Large transport has map shift on FMC, navigation error.

Attributes
ACN	241032
Time
Date	199305
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bwi
State Reference	MD
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 120 flight time total : 9500 flight time type : 300
ASRS Report	241032
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

After departing bwi we were given direct bustr then direct ihd. The fmcs after bustr had a map shift. We were advised by ATC that our heading for ihd was not correct. We then flew headings and manually tuned vors to fly the filed route. The FMC was unable to correct itself. There was no problem on the remainder of the flight to sfo.

Original NASA ASRS Text

Title: LGT HAS MAP SHIFT ON FMC, NAV ERROR.

Narrative: AFTER DEPARTING BWI WE WERE GIVEN DIRECT BUSTR THEN DIRECT IHD. THE FMCS AFTER BUSTR HAD A MAP SHIFT. WE WERE ADVISED BY ATC THAT OUR HDG FOR IHD WAS NOT CORRECT. WE THEN FLEW HDGS AND MANUALLY TUNED VORS TO FLY THE FILED RTE. THE FMC WAS UNABLE TO CORRECT ITSELF. THERE WAS NO PROB ON THE REMAINDER OF THE FLT TO SFO.

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.