EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP)
Confusion
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert
Aircraft
Approaching the BEWEE intersection on the CONLE1 RNAV Departure; Potomac Departure asked if we had been assigned a vector. We stated that we had not and that we were approaching the BEWEE intersection of the departure procedure. They informed us that we appeared to be 5 or 6 miles off course. Both the first officer and myself were puzzled since the proper runway and procedure were entered into the FMS. Additionally; both of our flight instruments were indicating that we were on course with the autopilot engaged. Upon further review when workload permitted; we reviewed our flight plan and did not notice any discrepancies. All standard operating procedures were complied with for an RNAV departure procedure to include briefings and autopilot engagement.
According to our flight plan and the visual indication we had in the plane (FMS and MFDs) we were on the CONLE1 DEP and on track. ATC called us later and asked according to our flight path where did we show ourselves? I responded with 'when you called us to inform us we were off course we were crossing BEWEE and initiating our turn towards OHSSS.' He responded with 'OK thanks'
EMB-145 flight crew reported ATC advised them they were off course while flying the CONLE1 RNAV departure out of BWI. Flight crew stated they showed right on course.