Quite ok but no

I this case now in use, to protect the Navis Ok but with the suction cup on the unit is the envelope quite tight.
At least you can in the net which you can well see from picture, at best, stuck a piece of paper.

Slightly more space you have, of course, if one decreases the suction cup, but where then that?
So again .... in the bag same problem.
Perfect it would be if you had space for the cable.

So not perfect, but a good protection for the Navi there is all!