Münster's local bathing lake for the masses is the local canal, "Dortmund-Ems Kanal". Excellent water quality & very popular
Looking for a project that fills a void - @todendah suggested: "I want to know whether it's too cold!". So that became our first project deployed in the wild.
Starting today we have deployed a solar powered temperature sensor at Stadthafen 2. We are really curious how long it will last. :-)
The sensor is autonomous (solar) and very close to water so we are not yet convinced that it will last. The river police however speculated that it will get nicked first. :-)
More documentation will show up on the wiekaltistderkanal.de page and in the FreifunkLP Forum