Tide Table Chart app for the Amazfit smartwatch.
The Amazfit app requires Zepp OS 2.1 or later.
It does not work for Amazfit devices with Zepp OS 1.0.
If it works for your device, you can find the Amazfit app "Tide Table Chart" in the app store of the Zepp phone app. The Zepp store shows you only apps that work for your device.

Please read the FAQ