Well...
Satnave jeans for wimmin are justifiably getting ridiculed for being patronising nonsense. But... Satnav that nudges the wearer in the right direction might have a lot of uses. Fitted to a helmet, jacket or safety gear it could be a winner in hostile environments where holding a screen might not be practical.
I ride motorbikes and it might be preferable to having a satnav on a wobbly handlebar mount