Date: 201909
Local time of day: 1801-2400
Location: LGA.Airport, NY
Light: Night
Aircraft: B737-700
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Taxi
Airspace: Class B LGA
ATC / advisory: Ramp LGA
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Not Flying
Reporter qualification: Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Human factors: Situational Awareness; Confusion; Troubleshooting
Anomaly: Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Taxiway
Detector: Person Flight Crew
When detected: Taxi
Contributing factors: Chart Or Publication
Primary problem: Chart Or Publication

Narrative: As were taxiing southeast on Taxiway Alpha; another inbound aircraft was stopped adjacent to perpendicular Taxiway Kilo. Ahead of that aircraft there was an outbound aircraft attempting to get access to Taxiway Bravo. He was pointed northeast on Taxiway Lima. There was a long line of aircraft on Bravo waiting to depart [Runway] 31. The aircraft in front of us was cleared into his gate at Spot X and quickly moved out of our way. We were to access Gate X by using Spot Y. The aircraft waiting to access Bravo was on Lima with his tail pointing out into Taxiway Alpha. By this time; I had pulled up my LGA 10-9B chart for more detail of the Terminal C area. It was fairly dark that night; especially so because our Taxi light was MEL'd. I had been using the right Fixed Landing light until we were southeast on Alpha. I didn't want to interfere with the traffic taking off on [Runway] 31.I'm very much aware of the procedures in and out of the LGA ramp area. I fly in quite frequently and am familiar with the problems we were having lately with Green Islands. With all of this in mind; I made a comment to my First Officer that I didn't know why they wouldn't let us use Spot X. There was clearly an aircraft in the way of us having access to Spot Y. I wondered aloud why the Ramp Controller wouldn't have cleared us in at Spot X; especially since there was not much going on in the ramp area and he likely had a bird's eye view of our hold-up. Looking at my displayed 10-9B chart of the ramp and not seeing any islands detected east of Spot X; I asked the First Officer out loud 'Do you have any problem with me coming a little right around this aircraft (at Lima)? He said 'No.' I turned the nose slightly to the right; expecting to rejoin Alpha after clearing around the other aircraft. As I did; I saw blue reflectors on small poles. It was clear now that there was an island between Spot X and Spot Y. At this point; I slowed the aircraft and turned more; as to enter the ramp at Spot X. I could not turn back left at this point. I asked the First Officer to ask Ramp if we could come in at Spot X. Just as we turned; Ramp Control got on the frequency and stated 'Company; you can't just come in any Spot you want. There are rules.' He went on. At the gate; we looked at the charts more. The 10-9B chart is completely missing the island between Spot X and Spot Y. The depiction of the island in front of Concourse B on the 10-9 chart is completely wrong - it depicts the island as continuous from Spot Z all the way down to Spot Y. How can these charts be wrong so long after construction is complete?! We depend on these charts to be accurate. The only chart that appears to be correct is the Company LGA SIP page. That chart has a red 'DO NOT TAXI' notation detected on it - Perhaps the official Jeppessen charts that we use for navigation should too. Yes; we were aware of the statement under 'Taxi In' that directs us not to cut across for access. It was not our intention to do so; only the result of a missing island from the 10-9B. These charts really should be corrected; to accurately depict the actual locations of the islands.




Synopsis: B737-700 Captain reported the island at position 8A on the Jeppsen 10-9 chart is not depicted on the 10-9B chart; causing confusion and possible taxiway incursion.