How to acquire sonar dying light?

How to unlock: Listen to Tolga and Fatin over the radio when exploring the Slums.

Difficulty level: medium

Reward: 1000 experience

You can unlock this side mission shortly after completing the Assault and Batteries quest. During free exploration, Tolga and Fatin will contact you over the radio. You have to meet them in Fisherman's Village (Fisherman's Village on the map). In the first part of the quest, you need to bring them some items used in crafting: 10 Power Cables and 10 Duct Tapes. They are not so frequently found in the game world, so it may take you some time to collect them. Look inside buildings, especially the ones that you visit during other mission.

After you bring the items, Tolga and Fatin will want you to go search for a sonar. This time, the objectives will be more specific - the object is located in a military camp on a bridge, near the east edge of the map (number 24 on the map). Some part of the bridge is broken, so you have to climb up and then slide on a rope. Start climbing in the place to the west from the mission objective (number 15 on the map).

The main part of the climbing is described in detail in the walkthrough to the Searchlights quest. Similarly, in this mission, you first have to reach almost the top of the bridge, specifically the place where the safe zone is. When you're there, look for metal balconies that will allow you to go higher. Continue climbing using the balconies.

Your goal is to reach a metal balcony, from which you will be able to grab the rope shown in the picture above. Slide down the rope to reach the military camp (number 24 on the map). This way you will go past the broken part of the bridge.

Start exploring the military camp, but watch out for the zombies. The sonar that you're looking for should be located in the last tent (the easternmost one). After obtaining the item, listen to Tolga and Fatin over the radio.

Note - Wait until Tolga and Fatin's supervisor - Volkan Dal, contacts Crane. It will allow you to unlock another side quest called The Launch. This quest can be completed in the area where the Antenna is, so look for a walkthrough in the chapter called Side Quests - Antenna.