Widebody Transport
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Engineer
Flight Crew Last 90 Days 150; Flight Crew Total 15000; Flight Crew Type 5000
Confusion; Situational Awareness
Deviation / Discrepancy - Procedural Clearance; Ground Incursion Taxiway
Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented
Aircraft
[We] taxied to Runway 20L from base of Tower. Out F5; [we] missed left turn on A. No signage at all on airport for taxiways and runways. No other aircraft around. Ground Control just directed us then on 20R to proceed to 20L. First Officer went 'heads down' for a moment. Field was unfamiliar to us and much less sophisticated than all other international airports we use. Next time; I'll make myself more familiar with the unmarked taxiways. It sure would help if the airport would go to the effort to put signs/markings in place.
RPLC has no runway or taxiway signage so after a flight crew missed the turn from Taxiway F5 onto Taxiway A they were directed to taxi on Runway 20R.