Just to note the correct address is:
The link I gave is the pre-nostr version:
The landing page go.yondar.me has useful info like
"What is my location used for?
Your GPS location simply shows where you are on the map in relation to other places. It can be helpful if you want to put a new place right where you are!
Your location is not transmitted, and our code is open-sourced to prove it. We are regular people who value our privacy, so we built Yondar to do the same for you."