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To move the blue circle I have to press and hold. It took me about a minute to figure this out. Instinctively I was just clicking on it.
It can also be moved by double tapping on the map.
Maybe make it dragabble by its center? But then, what happens if the user is just moving around the map?
Or, just, make a tour showing all these "hidden" features.
Options, options... maybe some usability testing like in "Don't make me think"?