I am very sorry to hear of the GPS on the Watch not working properly. Your Samsung smart watch has a GPS sensor that can monitor your real-time location without connecting to a phone. When the watch is connected with a phone, it will obtain its GPS location from the phone to help improve the location accuracy. However, GPS on a Galaxy Watch Active2 may not be accurate or take longer (about 2-3 minutes) than usual to obtain your location if the watch is disconnected from your phone for more than a day. Try these steps: https://www.samsung.com/us/support/troubleshooting/TSG01203472/
Please let me know if this helps, thank you.