does apple watch series 3 gps come with a usb power adapter?

Hi! I see you are wondering what comes in the box with an Apple Watch Series 3. On the purchase page of the Apple Watch you can see what comes in the box. For then Series 3, you should get everything in the picture below.

So in the case of a GPS only model, it seems you won’t get the power adapter. However, its the same one that comes with your iPhone. Or you can purchase another one here: https://www.apple.com/shop/product/MD810LL/A/apple-5w-usb-power-adapter?fnode=1196c6b31250f8269f648d2f015b52bfc25edc1acb3fcaed6d7a4c56f58f5c3914fbce0c592edd6f5abccfffabfaa351f65ebf07c2a6d0f459dd863c1a75978e9d652daab0c3688d636fb3f499bdbaa7cdcb110c182869e83dacb6680a88e3cf

Hope this was helpful!