What a mug
It literally doesn’t work, and when you try to load more charts it says the app isn’t available in my region (the UK).
Hope you enjoy my money whoever you are, Martin.

Archived App
This is an archived listing of the app previously available on the App Store.Access all 26 offline sea maps for the English Channel, displaying tidal stream direction and rate at hourly intervals. View today's tides at Dover with an internet connection. Zoomable charts are optimized for both iPhone and iPad.
2.1
April 11, 2017
This app has been updated by Apple to display the Apple Watch app icon. V2.1 - Modernized code, some minor bug fixes in text and graphics.
MoreTidal Stream Atlas provides all 26 sea maps for the English Channel, showing tidal stream direction and rate at hourly intervals. It is available offline for all charts.
Yes, all 26 sea charts for the English Channel are available offline. An internet connection is only required to view today's tides at Dover.
Tidal Stream Atlas is universally available on iPhone, iPad, and iPod. The sea maps are zoomable for optimal viewing on any screen size.
Tidal Stream Atlas is a paid application, priced at $4.99. There are no in-app purchases or advertisements.
The latest version, 2.1, was released on April 11, 2017. The app was initially released on September 17, 2016.
Tidal Stream Atlas has an age rating of 4+, making it suitable for a wide audience.
The sea maps display both the direction and rate of tidal streams at hourly intervals using graded arrows. Mean neap and spring tidal rates are shown in tenths of a knot.