Date: 201910
Local time of day: 1201-1800
Location: ORD.Airport, IL
Flight conditions: VMC
Light: Daylight
Aircraft: EMB ERJ 145 ER/LR
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Ferry / Re-Positioning
Flight phase: Taxi
Reporter organization: Air Carrier
Reporter function: Pilot Flying; Captain
Reporter qualification: Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Human factors: Confusion; Communication Breakdown; Situational Awareness
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Taxiway
Detector: Person Air Traffic Control
When detected: Taxi
Result: Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented
Contributing factors: Company Policy; Chart Or Publication; Human Factors; Procedure
Primary problem: Chart Or Publication

Narrative: We were brought by maintenance personnel to the aircraft parked remotely on the [maintenance ramp] at ORD. As a crew we performed our normal preflight preparations. During the threat forward briefing we made sure to thoroughly familiarize ourselves with the taxi plan since we don't normally depart from this location. The First Officer had not been on this part of the airport previously and I had but not in a long time and not since construction had taken place. We referenced the company procedures. The section on remote parking talks about procedures for taxiing from the North Ramp. We did not need to call for a move team person to be a spotter for us during engine start since the mechanic who had driven us up there had stayed for this purpose. We also referenced the map. We noted that this map is out of date and disagrees with the [company procedures]. Taxiway E on this page is actually now taxiway D and it still has runway 33 on it.We originally planned on going to the west gate but due to construction and barricades; we changed our plan to exit at the East Gate. The First Officer called the East Gate frequency even though the gate was already open just to advise them of us crossing the gate as it states [in company procedures] under YY Taxiway Gages Procedures. On this page there was only mention of having to call at the gate and no mention of a call to Ground. The First Officer called Metering as we were on YY/D. The Metering Controller gave a frequency change to contact Ground and said something along the lines of 'they will take you out from there'. The First Officer called and reported 'YY short of D ready to taxi for departure'.The Ground Controller said; 'Aircraft X; how did you get to D?' My first thought was; did we pull a little too far forward (maybe one aircraft length) in the corner here? I responded again with our position at the corner near the East Gate. The Controller informed us that YY is a taxiway and not part of the North Ramp and that next time we needed to call prior to movement on YY. We stayed stopped for a minute to reference our company pages and airport diagrams to see what we may have missed. After we felt on the same page as a crew; we called ready for taxi and resumed the taxi out and the flight continued normally. We feel that the company pages did not give us proper preparation for what the controller expected us to do. As a crew we had excellent CRM; TEM (Threat And Error Management); standardization and briefing. My distant memory of how I had done things the last time I had been up there supported our actions. I remembered talking to the East/West Gate but did not remember talking to ground again after the gate person. Nothing on our charts or pages suggested this. In addition; the markings on the North Ramp area did not offer any signage or surface markings to suggest that the area was considered a taxiway and not the undefined 'North Ramp Area' [page] is extremely out of date and the map needs to be updated.I feel we acted as a crew correctly given the information we had in front of us. We had good CRM and TEM. I think that these specific procedures need to be better explained in our company pages and the maps within our company pages need to be updated. It needs to be made clear that the area contained within the East and West Gate is not all ramp area and that any movement within needs an ATC clearance.


Second narrative: [Report narrative contained no additional information.]


Synopsis: EMB-145 flight crew reported that confusion caused by an outdated taxiway map resulted in a taxiway incursion.