What is required to develop a mobile application, the functionality of which makes it possible to search / detect users of this application in 10 m?

Question

Mobile development

What is required to develop a mobile application:
how many developers, how much capital and whether access to satellites is needed and for how long.

Answer 1

Nothing is needed, because the idea has been dead for 5 years, and not really having time to be born.
Reasons:
1. There is no 100% working way of positioning with an accuracy of 10m.
2. The issue of privacy. How, say, to protect a girl from a maniac?

Answer 2

We need developers, capital, access to satellites, and so on.