So I am in possession of a TomTom sat nav, it fits hervoragend on the pillow and holding on the pillow, as well as on the disc. The weight of the bag is, I think sufficient for all Navi's. You should just be careful, that is the surface of Amaturenbretts not too rough and it is dust-free, otherwise the adhesion of the cushion is not guaranteed, In the car where I tested the cushion it has held good rider but two, I will in any case continue to use, not always having to wipe it ollen rings on the disk away for the sole reason.