BKS BINNENSCHIFFAHRTSKONTOR SOMMERFELD GMBH.
image contributed by Klaus-Michael Schneider, 21 April 2009; sighting 13 March 2007
A white saltire divides the flag into red and blue, with a central white disc containing a red capital S. Klaus-Michael Schneider saw it at Billwerder Bucht in Hamburg in March 2007; Jan had also seen it in Berlin in 2006. Initially unidentified, it was later assigned to the company, whose website supplies the flag. No funnels were apparent on the current inland craft.