AF251 was ringed in Hamburg in January 2010 and has been seen in every subsequent winter back in Hamburg, arriving back in Aug/Sep and leaving in February. There have been a couple of sightings during the other months indicating where it goes in the breeding season as it was seen in Minsk, Belarus in March 2016 and in Poland in March 2015 (where it was probably on passage as it headed further east).
AF395 was ringed in Hamburg in Feb 2014 and apart from a sighting in Poznan, Poland in Jan 2015 has been regularly re-sighted in Hamburg
AF288 was ringed in Hamburg in Dec 2010 and has been re-sighted back in Hamburg every winter since but has never been spotted anywhere else during the breeding season.
A980 was ringed in Wedel in Feb 2013 (just west of Hamburg) and has been seen in Latvia in Apr 2013 and Mar 2016.
AF611 was ringed in Hamburg in October 2015 and has not been seen anywhere else.
AF377 was ringed in Hamburg in Jan 2014 and apart from a sighting in Poland in March 2016 has not been seen anywhere else.
A314 was ringed in Hamburg in Dec 2012and has been regularly re-sighted each winter apart from sightings in Gdansk, Poland in Mar 2014 and Kaunas, Lithuania in Mar 2016.
T64H was seen by me in Bremen and is from Poland but no further details have been received.