Thank you for your post, however the place names are not controlled by Windy.
Please see the following posts about how the map data for Windy is sourced and displayed from www.openstreetmap.org:
Please also note: For every language, a different place name label can be displayed, so please choose your correct language and data display.
Further discussion of place name and language issues or disputes should be directed to the OpenStreetMap Forum here: https://forum.openstreetmap.org/index.php > scroll down & select > users: (the relevant country for your dispute and/or question)
In the case of a political dispute please leave such topics out of the Windy forum and instead focus on the discussion of weather.
Thank you :)
Good idea even if Openseamap shows a coarse sea bottom with water height isolines of 100m / 250m / 500m / 750m / 1000.... That would be enough.
Otherwise there are much more precise marine charts like OpenCPN but would it be worth for Windy which is not a navigation app?