I used golfpad years ago on the original GW. Worked well for me originally. You did need your phone to locate the course from their database, but once found it worked standalone on the watch. There was a free basic version that just gave distances to front/back/middle of the green which was enough for me. Then they had a big update that absolutely killed the battery life (went from 8-10 hours while golfing to barely 5 hours) and changed it to subscription only. Worst thing about that was the difficulty that some had, based on reviews, transferring the account to a new watch.
So what I'm looking for is a basic gps app that will give the distances to the green, does not kill the battery in one round, and can be purchased outright at a decent price. No yearly subscriptions..