I've changed the sd-card with the jnx of my O600 to my O300 (that one is already patched for jnx-files): the slope-inclination map works fine on my O300.
So when I have a patches firmware version on the O600 it will also work well.

(MyO600 has the latest firmware already and it's just a test. I am not changes the firmware on my O600 at the moment, although I see that the latest firmware (v4.40) has now been patched ).