I had the idea a while back, it's great to see it implemented so well!

One suggestion though, the fact that use cases are wide open could stifle growth. I'd suggest a few different landing pages you could A/B test, each covering a very specific use case.

You could have one page explain that you can save your parking spot and share it with others. Another for sharing a meetup location. Another for saving your favorite locations. Yet another (where you may win big) would be easy location saving for photo and film location scouting.