The Sons of the Forest grave is a site that you will discover early on in your story. Just moments into the sandbox game, you uncover your GPS tracker, which itself will trigger your first story task: Find Team B. Three members of your team will then be indicated on your GPS tracker by a purple marker - one of which is, sadly, a gravesite, but it does hold the answer to finding the shotgun.
The Sons of the Forest purple marker in question appears on the north-west corner of the map, on land (the next nearest marker is in the ocean). Head there, and your GPS tracker - which operates as your Sons of the Forest map - will start to beep. In fact, it gets quite distracting, so once you know where you're going you may want to put your map down using the 'M' button. It's also worth mentioning that you'll need to have found the Sons of the Forest shovel first. Here's everything you need to know before reaching the purple marker grave and digging up that Sons of the Forest shotgun.
RELATED LINKS:
Sons of the Forest weapons list
Sons of the forest shovel location and how to get it
How to get water in Sons of the Forest
