I’ve just read the README.MD file in the Sources/iOS folder,
- you have to be an iOS developer
- you are getting the stock Apple NI application from the developer web-site
- once you got that stock application, you can apply a “patch” from the Sources/iOS directory, which will update the stock Apple NI application and make it look differently, i.e. will add a 2D/3D arrow for a better visual experience.