Using nmap to find SSHd

Living in Copenhagen with kids, we are often visiting playgrounds. In almost any weather. Which is nice. It's kind of a local thing. It's rare to come across an empty playground. And on sunny days, they are the true waterholes of the city for many parents :o) The commune of Copenhagen even have a map, of all their playgrounds. However this does not include playgrounds not operated by the commune. Fortunately Open Street Map have a lot of playgrounds mapped. Regardless of who operates them. But ...