Well, kinda.

I just received the Lowrance Lake Insight HD map SD I ordered. I put it in my HDS7 and now can zoom to 20 feet with full panel or 2 panel screen views. This "chip" has far more detail than the "built in" Insight maps. I installed the new "chip" in my HDS8 which has factory installed Insight maps. The unit loaded the new Insight map. I can now zoom to 100 feet with shaded relief maps. Before, I could only zoom to .2 miles without loosing the shaded relief imaging.

This picture is a shaded relief view of one of my go to locations. The shaded relief seems to be accurate as far as location goes. I will find out more as time goes by.

So to zoom to 20 foot without pain, you can get the Insight HD maps........