Every marine GPS navigator I have used since they dropped below the 5000€ tag has had too bright night light.

I set the latest chart plotter I used, a Garmin 4010,to faintest light and it was still far too bright.  Don’t marine chart plotter manufacturers use their own products?

Update:
I was in contact with one manufacturer (Garmin?, can’t remember) and they said that in next version it will be better.