There are some conditions that you need to make sure you have to enable his spawn.

• Make sure it's daytime
  
• Confirm clear weather (no rain or snow)
  
• Set up a camp a short distance from the target area
  
• Sleep until it's day or noon
  
• Save your game

This exact location on the map there is a spawn, he will be laying down on the ice, don't get too close and use your binoculars to study the animal then after that you can use a good rifle gun to hunt it. in case if this didn't work just reload the game save and try this method.






Really hope it works for you, it took me about 2 days to finally find it. it's VERY hard