That part's always seemed a bit curious to me, though IANAL, so maybe they can get away with it. Can you really simultaneously: 1) advertise a product as being fit for a particular purpose; and then 2) disclaim any responsibility for making it fit for that purpose?
If it were labeled something like, "novelty product, not to be used for actual navigation", I could see that, but GPS manufacturers position their systems as ones you should actually use for navigation.
If it were labeled something like, "novelty product, not to be used for actual navigation", I could see that, but GPS manufacturers position their systems as ones you should actually use for navigation.