EMB145 flight crew has a track heading deviation on the eldee 1 RNAV to dca.

Attributes
ACN	719804
Time
Date	200612
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dca.airport
State Reference	DC
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : pct.tracon tower : orf.tower
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival star : eldee
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 245 flight time total : 3000 flight time type : 1030
ASRS Report	719804
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time total : 3000 flight time type : 2500
ASRS Report	719803
Events
Anomaly	non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Ambiguous

Narrative:

As the PF of the eldee 1 RNAV with the autoplt engaged; we were informed by ATC that we were off course. This alarmed us because all of our equipment (FMS and mfd map) showed us on the appropriate course. We were approaching the 'manne' intersection at the time. We informed ATC our equipment showed us on the correct course; and ATC gave us a left heading which we complied with. ATC informed us that the same thing has happened to other aircraft on the arrival recently. Our FMS database was current and we had the most up-to-date charts. Since all of our indications within the airplane showed us on course and our database and charts were current; it leads me to believe there is a problem between our equipment and either the eldee 1 RNAV arrival itself or ATC's equipment.

Original NASA ASRS Text

Title: EMB145 FLT CREW HAS A TRACK HDG DEV ON THE ELDEE 1 RNAV TO DCA.

Narrative: AS THE PF OF THE ELDEE 1 RNAV WITH THE AUTOPLT ENGAGED; WE WERE INFORMED BY ATC THAT WE WERE OFF COURSE. THIS ALARMED US BECAUSE ALL OF OUR EQUIP (FMS AND MFD MAP) SHOWED US ON THE APPROPRIATE COURSE. WE WERE APCHING THE 'MANNE' INTXN AT THE TIME. WE INFORMED ATC OUR EQUIP SHOWED US ON THE CORRECT COURSE; AND ATC GAVE US A L HDG WHICH WE COMPLIED WITH. ATC INFORMED US THAT THE SAME THING HAS HAPPENED TO OTHER ACFT ON THE ARR RECENTLY. OUR FMS DATABASE WAS CURRENT AND WE HAD THE MOST UP-TO-DATE CHARTS. SINCE ALL OF OUR INDICATIONS WITHIN THE AIRPLANE SHOWED US ON COURSE AND OUR DATABASE AND CHARTS WERE CURRENT; IT LEADS ME TO BELIEVE THERE IS A PROB BTWN OUR EQUIP AND EITHER THE ELDEE 1 RNAV ARR ITSELF OR ATC'S EQUIP.

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.