EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Flight Crew Requested ATC Assistance / Clarification
Aircraft; Human Factors
During arrival in to ORD on the VEECK 3; around the KAYTO waypoint we noticed on the map page that the aircraft was west of the depicted course line. The CDI was centered and the FMA indicated all normal modes were active. At this time the Capitan called ATC to confirm position; while I deleted the winds aloft data from the FMS. The deletion of the winds aloft was unintentionally deleted late and was just missed by the crew; despite our best efforts and my personal memory aid. We had been deleting the winds aloft all day but; it was missed on this flight. ATC did confirm we were off course by about two miles however; there was no conflicts with traffic. We asked for vectors and continued into ORD per SOP.Until the software issues are solved for this software load I recommend an ACARS alert at top of descent and/or adding a line to the checklist to verify the cruise winds are removed from the FMS before decent. I hope this software can be fixed ASAP. I have seen the fuel on landing calculation change by an addition of 800 lbs once the winds were removed. This can set a trap for the crew to think they have more fuel at landing than they actually do.
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ERJ-170 flight crew reported being off course during a STAR due to not deleting the average winds aloft data at the top of descent from the FMS. An FMS software bug required this action.