Not everything hostile on Chernarus is a player. Bosses from Tarkov walk their ground with their guards, squads guard crashed convoys and downed helicopters, airdrops fall on a timer and warn groups with a radio in advance, and a patrol helicopter and a BTR tour the map. Every one of them drops its loot. A working radio in your group puts airdrops, patrols, crash sites and the marked boss events on your map; the other bosses are a surprise. Bosses.