Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe
General None Reported / Taken
Aircraft; Airport
Non Pegasus B757; map showed slight displacement at TIST Runway 10 Hold Short; but quick position reference (Q10) was not available in the database. On takeoff in Day VMC with unrestricted visibility; GPWS alerted due to map shift. All terrain was in sight at all times. I increased rate of climb slightly but did not fully accomplish escape maneuver. If memory is available; quick position reference data should be available for all regular destination airports.
B757 First Officer detected a slight FMC position error taking Runway 10 at TIST for departure and elected to continue the takeoff in VMC. A GPWS terrain warning is generated just after rotation; but the departure path is visually clear.