I can only assume. I use Golfshot GPS every round but always use my iPhone. I'm not getting the AW2 but would be nice for it to be a standalone and be able to leave the phone in the cart/bag if needed.
No it does not. No cellular data, no WiFi, no Bluetooth necessary. Purely GPS. So the Apple Watch Series 2 should not need the phone at all to work with GolfShot. I might get one now!