There are magnet Implantats you can put into your finger which lets you feel magnetic fields.
If they would restore vision by using e.g. the cochlear nerve, that would be something.
I've heard about people experimenting by wearing a belt with dozens of haptic motors and a compass, so that it always indicates the direction of north. After a while wearing it, they stop consciously feeling the sensation of the vibration, and just feel "northness". And then when they take off the belt, they feel weirdly disoriented for a while, even in familiar places.