Thanks for the response on the Radome. Here's another.
Switched from a RL70RC to a RL80CRC Plus. Moved the Cmap
cartridge over (2002) to the new unit, and I get no chart
information at any zoom level greater than 3 nm. I have put the
chart into another RL70CRC unit at Boat US, and the detail is there.
That unit's OS was 4.09

I noticed that the OS version for the 80 was 2.09 so I
ordered and installed the latest update, bringing it to 4.11
Same problem.

Could it be that the 10.4" display has different chart requirements
than a 7" display? I find that hard to believe, except that the
80 will go down to 1/64th of a mile, where the 70 is either 1/2
or 1/4, I don't remember.

Just checking to see if any Raymarine techs have seen this, and
know exactly what's going on.

I've tried it on both simulated, and real data because of the Radome
issue discussed elsewhere.