APRS in voluntary sea rescue service use

Just now there is quite a bit of APRS activity at sea in front of Helsinki. This very versatile amateur radio service has been made much more visible by integrating APRS data to Google Maps. Just log in to the following site: http://aprs.he.fi. and zoom to Helsinki. I've understood that this integration of APRS trackers into the voluntary sea rescue vessels is quite unique in the whole world.