@GiPFELKiND thank you for the location information.
Now look: with tides, there is no service that is more “official” than another. There are different models that might come up with different results.
Like there is no “official” weather forecast, that is always correct, because it is official.
The question, which service is used by Suunto has been answered already: https://forum.suunto.com/post/198380
Have a nice time in Wyk, and tell me, what practical impact the few minutes difference in those models had for your tea drinking activity.