With the right scopes and sightlines, you can see for hundreds of meters in PUBG, but crucially grass stops being visible at around the 200m mark. This means that if someone decides to lay down, they may think they are well covered, but anyone more than 200 meters away can see them clearly. You are always much better trying to find hard cover like a tree or wall (or even getting in a bush) than trying to lay down in the grass until the late stages. This also means that hitting the deck in a field when shots come in is a terrible idea. Just run to cover instantly.
