Faction Supply

When a supply spawn, you will have a notification and a
waypoint named "supply" will appear on your map
(can be open with pressing "O").

To have the notification you need to unlock map part by
right-clicking on map blocks that can be found in game
in zone you need to unlock.

 

Supply spawn generally one care package with very good loot
and precisous items, they can spawn in buildings and in/on vehicle.