Bunkering vessel "Catharina" (Chill Island)

[Jens Boldt]

Hello all,

in April 2012 I took the following photos here at Hamburg

http://www.shipspotting.com/gallery/photo.php?lid=1535945
and
http://www.shipspotting.com/gallery/photo.php?lid=1535946

So far I couldn't find anything about her on the net. Only today I learnt that she was a former bunkering boat.
But searches for "bunkering vessel or boat or tanker Catharina" proved to be fruitless, too.

So does anyone happen to know something about her? Or maybe someone knows the funnel mark which can be seen in the stern view?
Does someone know what "Chill Island" means?

Maybe she was in private hands as a party boat...

Thanks for your help in advance.

Kind regards,
Jens