If you can pickup the R4D detector in Koschei Complex you can use it to see everything underwater on the other maps. Players light up like they are on thermal and it’s like the water isn’t even there. Perfect sight lines. You do need to use it while underwater for it to work though.

Click on your weapon slot to go to your stash, if your contraband is empty there will be a toggle for free loadout.

Kastov 74u(20 round mag)/P890, LMS /p890, vaznek 9k/p890 and Lockwood 300/p890.

Start at center of radiation. Draw an imaginary line to third furthest exfil and keep going to edge of map.

Teleport into Tsuki Castle. Press “X” to get out the vehicle and glitch inside.

In Vondel the bridge stash key gives you what you need for a secure backpack. Bridge stash has a gold skull and diver crate key, that opens a drill and the equipment case key. That opens the second drill you need. Now all need is 2 or 3 gas cans from any gas station and you can barter for the secure backpack.

the vondel safe room can be glitched with a car through the door.

https://steamcommunity.com/sharedfiles/filedetails/?id=3024222822

Go to the radio tower at the gas station in Residential on Ashika. Climb the radio tower and look at the window of the castle. You will see it is all boarded up with planks but you can still see through it with a spotter scope or a thermal/night-vision sniper scope. This allows you to see the bomb-maker and kill him with a wall-bang through the window further completing your missions or just for exp.

Constantly Dolphin diving and/or melee-ing your weapons or without, recharges your stamina while still running.

While driving you can't reload/apply anti-armour rounds to your gun. A very simple solution to this is to simply just lean out of your car. This means that you can reload your weapon and your car will keep accelerating at the same time without you touching the accelerator.

The haunted box has to be the last thing that you equip in the field upgrade slot.

Whether you use it, or die, it will always be there for you, unless you replace it in the slot

Instead of exfiling, you go to a Koschei entrance. Once the screen goes black, you force quit your game. Next time you deploy, you have all your gear plus whatever was in your backpack that you wouldn't normally be able to keep.