What happened to the Georg Buechner?
Tug Ajaks did a towing speed of app. 4,5 kn, then suddenly changed course southerly with a speed of 9,9 knhttp://oi42.tinypic.com/a9ppur.jpg
You need to look at a higher magnification, Miraflores to see the sequence better. I've tried a rather amateur interpretation on the attached track:
1 - between 1630 and 1645 AJAKS made a gentle turn to port at 4-4½kn, about 135° to 90°
2 - about 1700 the speed dropped to 2-2½kn though she continued steadily eastwards.
3 - about 1745 she was reaching the easternmost point with speed falling again.
4 - almost came to a stop at 1745 and turned back
5 - initially there seems to be a hurry - this point shows 7kn! If that is right the GB cannot have still been connected
6 - most of the track between  and  was at very low speed ½-1kn, but note that  at 1830 her heading is reversed at 71°, suggesting that she was circling
7 - still slow speed at 1905. That looks like the point (LAT = 54-55,871′N LONG = 018-31,308′E) where she is reported sunk at 1904: see http://www.shipspotting.com/gallery/photo.php?lid=1810236
8 - another apparent circling at 1937
9 - AJAKS leaves the area at 1950, 10kn for port.
X - looking at what I take to be a search pattern this is my best guess as to where she sank - or perhaps further east on that straight track.