I know series 4 is out there in the market, but its important to know about series 3 as the price of series 3 will decrease with the launch of series 4.Series 3 non cellular has a gps which can be used in maps.Along with it mang watch faces are installed to keep the watch new.We can also change the watch bands.The watch is awesome to use.We only have one disadvantage that the screen gets scratches over long use of watch.The battery life is awesome and it lasts for 1.5 days