Stalker: Call of Pripyat → Quests → Area Maps
During the inspection of the Skat-2 helicopter, you might find several maps of the area. I should give them to someone, for a profit, of course. I remember there was a guide named Pilot at Skladsk. He'd probably be interested in the maps...
My guess was correct – he's interested in the maps. As a reward for them, he'll offer a discount on his services. 1,000 rubles for the passage from Yanov to Zaton is an excellent price, no doubt about it.
Source: gamer.ru
See also:
Terraria: Distortion (biome guide)
Fallout Tactics: Mount Cheyini
Atoms in molecules of organic compounds