To use TAG Heuer Golf on your connected watch, you first need to download the app on your mobile and then link the account to your watch. https://faq.tagheuer.com/articles/en_US/FAQ/How-can-I-pair-my-TAG-Heuer-Connected-to-my-TAG-Heuer-Golf-account
You also need a network connection (either via your phone or via Wi-Fi) to download courses. The watch will then be able to function in total autonomy.