Comment: The German North Sea fishing trawler was built in Papenburg at Jos. L. Meyer Shipyard in 1916. The ship was armed and took part of the German landing to Saaremaa in 1917. Was lost on 14 October 1917 between Hiiumaa and Saaremaa. 231 BRT, displacement 550 t, length 39,02 and width 7,10 meters, steam engine 500 HP, crew of 31 men.
Sources:
http://divescover.com/dive-site/wreck-altair-/41548
https://register.muinas.ee/public.php?menuID=en_monument&action=view&id=30728
The ship wreck is in the Estonian Maritime Museum registry ID 947, monument 30728. Diving the wreck requires a permission. It was found 4 July 2012. There is a permanent mooring buoy at the site.
The wreck location is 58:41.133 N 22:15.033 E, roughly between the islands of Saaremaa and Hiiumaa.
The wreck lies now at 26 m depth. It is broken into two pieces torn by a mine explosion. The bow part is about 10 meters and lies on left side of the main section.