I used for my test G2Vision map VEU710L - Denmark, Skagerrak & Kattegat, v11.50, FID2027

The size reduced from 1.65 GB to only 550 MB!

Actual G2Vision maps have beside the navigation map and the fishing map some additional features, like photos of harbours and POI in harbour cities and along coasts (e.g. restaurants, hotels, shopping facilities...). Those abdicable things are also removed, like the essential tide tables, when I deleted all tiles containing the word "Bitmaps" in the description.

I'm afraid it takes me much time to find out in which of the more then 10 bitmap tiles contained these informations.