Outdoor Navigation for visually impaired with UWB technology

I am going to create an Outdoor Virtual Guideline for blind People. The Guideline consists of many way-points. I want to “attach” the user to the Guideline by giving information about the distance to the Guideline.
Normal GNSS is not accurate enough for these users. I am a Mechanical Engineer and completely unaware of the possibilities of this Domain. Thanks in advance.