Ah think I've cracked it. With the help of Maparama.com and a hard study of the street names on the map.

17 minutes from the ferry terminal (at 18km p.h. !!)

Hafenstrasse for 70m
Swing right in Fabrikstrasse 210m
Swing left into Andreas-Gayk-Strasse 150m
Swing right into Ziegeltiech for 3km (Strange names they have here)
Then Kronshagener Weg for 130m
Continue into Skandinaviendamm for 3km.
Swing right into Stockholmstrasse 310m.

Roughly 6km.

Chas