Yeah I own this watch and it is infuriatingly almost accurate for my location, but drifts over the course of the moon cycle. I now just use it as indicative but check other sources if I want the exact high and low tide times. It definitely helps solve the main thing I wanted it for though: glanceable sunrise/set, moon cycle and tide strength (as well as approximate highs and low tide).

The app is kind of clunky and I have had issues with the live GPS tracking of activities but as they're not the main reasons I got it, I don't mind too much.