Here's a detailed guide:
(simple guide below)
 
 
Once you spawn in, have looted the bags/cases and got an axe, you are ready to explore the area or settle down for the night. Due to random spawning areas on the map I wont say if this would be to your right or left. But you should see a snowy mountains. Begin your journey towards the mountain. Collect as many sticks and leaves as you can on the way. (to build campfires; otherwise, you will be hypothermic). It is also recommended that you bring a bow or arrow to hunt rabbits. You can make Rabbit Fur Boots. But, they are optional and you can still traverse the mountains with them. Once you reach the mountain, you should look around at the base. Depending on your starting point, the Plane might be on the ground or a small cliff. This is where the flare (flare, which is on the ground inside of the plane), and the pilot's attire are located.
 
 
What the flare can do: It can be used to shoot cannibals and set them on fire, doing a lot more damage and quickly lighting dark areas.
 
How to find flares: Look for yellow containers on the ground. They'll contain either 3 flares (or a bunch of Arrows).
 
How to make a crafted Bow: Combine 1 stick with 1 cloth and 1 string to make it
 
How to get rope: You can either craft it using 7 cloth, or you can search for it in cannibal camp and on the yacht
 
How to make Rabbit Fur Boots: Combine 3 rabbit fur with 2 ropes
 
 
Quick step-by-step guide
 
 
1 go towards mountain
 
2 on the right, get sticks for campfires and leaves
 
3 views around the base
 
4 locate the front of the wrecked plane
 
5 Flare is located there
 
 

Images to aid with the guide

Gathering:
 

 
 
Mountain:
 

 
 
Making a bow
 

 
 
Flare boxes:
 

 
 
Mountain close up
 

 
 
Plane:
 

 
 
Plane close up:
 

 
 
Flare:
 

 
 
I hope you enjoy the How to find the Flare gun – The Forest guide. This is all for now! If you have something to add to this guide or forget to add some information, please let us know via comment! We check each comment manually!