1. HDS7 with base map.......................zoom in max 50ft range.
2. HDS8 with Installed Insight maps.....zoom in is 20ft range.

Called Lowrance. Talked to Linda@customer service. She verified this but tried to pass it off as normal operation. She didn't get far. ha.

She also verified:

HDS10 with installed Insight maps.....zoom in 20ft range.
HDS7 with Navionics chip maps..........zoom in 50ft range.
HDS8 with Navionics chip maps..........zoom 50ft range.

Need to check you zoom in function. Let me know.

Both my units have the latest updates.

Zoom makes a big difference, even with my Garmin.