OK, so after the plane has cleared the map you will see a white circle.
After the countdown on the bottom right of the screen you will see a blue circle slowly retract to the white circle.
If you are outside the blue circle you will take damage. The damage isn't a single hit, it chips away over time spent outside of the blue.
Once the blue circle reaches the white, it will stay still, and a new, smaller white circle will be generated somewhere inside the blue circle.
Again, a countdown until the blue circle contracts.
Eventually all remaining players are forced into a small geographical area, therefore eliminating long term camping or a stand off.
Also, the first time the circle contracts, the damage taken for being outside is minor. Each time the circle contracts the damage taken outside the blue is greater.
thanks for this Chris great help.
I'll give it another go.
I ignored the blue circle but didnt seem to take any damage that I could see? Perhaps it only counts from the 2nd white circle?
Tried last night I got killed by someone I couldn't see with a machine gun. haha