Haptic navigation, which uses vibrations to guide the wearer, could be used by people with visual impairments, but the first product to hit the market has been sold to the Royal Netherlands Army
Source:
https://www.newscientist.com/article/2249166-dutch-army-equipped-with-vibrating-belts-for-hands-free-navigation/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home