Navionics SonarChart - no depths in drying areas

I think Navionics have received so many protests (surely from France, at least) about the fact that their Sonar charts often showed "blu/always covered areas" in places which where instead drying areas, that they simply decided "ok let's keep these crowd-sourced data, but let's take off all the data covering drying areas about which we have no clue" :D
Pure speculation of course :)
 
That's really helpful, thanks. I can get much more detail now.

I still have to zoom in a long way though as shorn below, showing just before and just after the depths appear, but I guess that's just something I need to live with.

Thanks for the advice!
 

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