B777 reports not complying with taxi instructions after landing at panc in low visibility. A possibl...

Narrative:

After cat 3 approach and landing on runway 07R; we exited on taxiway right and expected to taxi north on right to the ramp. Ground instructed us to taxi on G and G1 to mike and then left on mike to right. The visibility was worse north of the runways and I was taxiing slowly but still unable to see very far ahead. The commercial ii chart seems to show G1 stopping at left and has a break between left and M. Because of the visibility and darkness we couldn't see G1 continuing northward and turned left on left to reach right instead of continuing north to reach M and turning left there to reach right. Ground saw us turn left on left and said that was ok and for us to continue to right and turn north on right to the ramp. We should have stopped and confirmed with ground what the taxi instructions were. The commercial ii chart is unclear and we should have confirmed with ground that G1 continued north even though it is not shown on the chart. I should have been more wary because of the limited visibility.

Original NASA ASRS Text

Title: B777 reports not complying with taxi instructions after landing at PANC in low visibility. A possible error in the Commercial II terminal taxiway diagram is brought to light.

Narrative: After cat 3 approach and landing on Runway 07R; we exited on Taxiway R and expected to taxi North on R to the ramp. Ground instructed us to taxi on G and G1 to Mike and then left on Mike to R. The visibility was worse north of the runways and I was taxiing slowly but still unable to see very far ahead. The Commercial II chart seems to show G1 stopping at L and has a break between L and M. Because of the visibility and darkness we couldn't see G1 continuing Northward and turned left on L to reach R instead of continuing north to reach M and turning left there to reach R. Ground saw us turn left on L and said that was OK and for us to continue to R and turn North on R to the ramp. We should have stopped and confirmed with ground what the taxi instructions were. The Commercial II chart is unclear and we should have confirmed with ground that G1 continued north even though it is not shown on the chart. I should have been more wary because of the limited visibility.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1060415
Time
Date	201301
Local Time Of Day	1201-1800
Place
Locale Reference	ANC.Airport
State Reference	AK
Environment
Light	Night
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Clearance Ground Incursion Taxiway

B777 reports not complying with taxi instructions after landing at panc in low visibility. A possible error in the commercial ii terminal taxiway diagram is brought to light.