Section 52 of the Water Traffic Act (782/2019) obligates anyone who notices a non-functioning aid to navigation to report the situation to the Finnish Transport and Communications Agency (Traficom). If an aid to navigation intended for marking a channel is not functioning in the manner indicated or if any such device has disappeared, been damaged or has drifted or causes confusion for some other reason, anyone who notices the situation shall report it to Traficom.
Report by phone to: 0800-181818
Or through the feedback service at the Finnish Transport Infrastructure Agency's webpage (External link)