Hideout Filin is a guerrilla hideout in Sierra Perdida, El Este. It gives you a safe fast travel point with a workbench and a grill, so you can resupply without going back to camp.
It works as a fast travel point once the Hideout Network is built at a guerrilla camp. Each hideout has a workbench and a cooking grill, and camp upgrades later add a guerrilla supply cache and a vehicle.
Use it as a staging point for nearby targets in Sierra Perdida. Eat a meal at the grill before a big fight, and swap gear at the workbench without a long trip back to camp.
Anti-Aircraft Site Lambda
Anti-Aircraft Site Lambda is an FND flak post in Sierra Perdida, El Este. It is out on the Lágrimas Islands, so plan a boat trip rather than a flight to reach it. Destroying it also gets you Depleted Uranium.
Anti-Aircraft Site Psi
Anti-Aircraft Site Psi is an FND flak post in Sierra Perdida, El Este. It protects Fort Fontana, so knocking it out first makes any air approach on the fort far safer. Destroying it also gets you Depleted Uranium.
Anti-Aircraft Site Theta
Anti-Aircraft Site Theta is an FND flak post in Sierra Perdida, El Este. It stands in Savannah Fields, close to the Biovida Research Facility. Destroying it also gets you Depleted Uranium.
Anti-Aircraft Site Zeta
Anti-Aircraft Site Zeta is an FND flak post in Sierra Perdida, El Este. Wreck the gun to fly safely over this part of El Este and pick up the Depleted Uranium stored at the site.