Narrative:

Cleared CEOLA3.ceola runway 18L; route/legs checked at gate. Fixes checked during taxi but prior to crossing to west side. 5 NM range selected for precision. After rotation noted unusual turn to right followed by no speed restr on rms. Had first officer verify departure procedure at which time both of us realized that larrn had dropped from route and we were direct gigem. Immediately notified ATC who gave us a 270 degree heading. Subsequent direct clearance to cnx showed disagreement between maps of approximately 3 NM. No further FMC anomalies noted. As pilots we tend to want to get tasks done early which is not always good. In the future I will check RNAV initial fix just prior to taking runway and leave the range in 10 NM or greater for route. Supplemental information from acn 708731: captain and myself did proper leg and waypoint checks at gate which included ceola departure altitude; speed xings. After takeoff we complied following magenta line and noticed that it had us starting a turn about 400 ft which seemed unusual. Xrefed the departure and noticed that we had lost our first waypoint. I immediately typed it back in and advised ATC. ATC advised us to turn to a heading and continue our climb. It happened to be a very slow workload meaning not a lot of departures. ATC then gave us direct a fix; selected abeam points and asked how did it look in plan mode; looks good; and executed. Our track was to the right of our aircraft symbol and we had to try it again in which it worked. This aircraft in my 3000+ hours is not known for having these kind of anomalies; but never say never.

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Original NASA ASRS Text

Title: A B737-800 DEPARTING DFW ON THE CEOLA 3 DEP DEVIATED FROM THE CHARTED TRACK WHEN THEY EXPERIENCED A MAP SHIFT.

Narrative: CLRED CEOLA3.CEOLA RWY 18L; RTE/LEGS CHKED AT GATE. FIXES CHKED DURING TAXI BUT PRIOR TO XING TO W SIDE. 5 NM RANGE SELECTED FOR PRECISION. AFTER ROTATION NOTED UNUSUAL TURN TO R FOLLOWED BY NO SPD RESTR ON RMS. HAD FO VERIFY DEP PROC AT WHICH TIME BOTH OF US REALIZED THAT LARRN HAD DROPPED FROM RTE AND WE WERE DIRECT GIGEM. IMMEDIATELY NOTIFIED ATC WHO GAVE US A 270 DEG HDG. SUBSEQUENT DIRECT CLRNC TO CNX SHOWED DISAGREEMENT BTWN MAPS OF APPROX 3 NM. NO FURTHER FMC ANOMALIES NOTED. AS PLTS WE TEND TO WANT TO GET TASKS DONE EARLY WHICH IS NOT ALWAYS GOOD. IN THE FUTURE I WILL CHK RNAV INITIAL FIX JUST PRIOR TO TAKING RWY AND LEAVE THE RANGE IN 10 NM OR GREATER FOR RTE. SUPPLEMENTAL INFO FROM ACN 708731: CAPT AND MYSELF DID PROPER LEG AND WAYPOINT CHKS AT GATE WHICH INCLUDED CEOLA DEP ALT; SPD XINGS. AFTER TKOF WE COMPLIED FOLLOWING MAGENTA LINE AND NOTICED THAT IT HAD US STARTING A TURN ABOUT 400 FT WHICH SEEMED UNUSUAL. XREFED THE DEP AND NOTICED THAT WE HAD LOST OUR FIRST WAYPOINT. I IMMEDIATELY TYPED IT BACK IN AND ADVISED ATC. ATC ADVISED US TO TURN TO A HDG AND CONTINUE OUR CLB. IT HAPPENED TO BE A VERY SLOW WORKLOAD MEANING NOT A LOT OF DEPS. ATC THEN GAVE US DIRECT A FIX; SELECTED ABEAM POINTS AND ASKED HOW DID IT LOOK IN PLAN MODE; LOOKS GOOD; AND EXECUTED. OUR TRACK WAS TO THE R OF OUR ACFT SYMBOL AND WE HAD TO TRY IT AGAIN IN WHICH IT WORKED. THIS ACFT IN MY 3000+ HRS IS NOT KNOWN FOR HAVING THESE KIND OF ANOMALIES; BUT NEVER SAY NEVER.

Data retrieved from NASA's ASRS site as of January 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.