"Theseus" at the German Bight heading north using her SkySails kite as an auxiliary propulsion system.
More information can be found here:

http://www.skysails.info/english/

IMO number : 9390159
Call Sign : A8SH3
MMSI : 636091757
Gross tonnage : 2450
DWT : 3667
Type of ship : General Cargo Ship
Year of build : 2009
Flag : Liberia (since 01-06-2009)
Length: 87.83 m
Main Engine: 8 M20 C Caterpillar, 1520 kW
Speed: 11.00 kn

Shipyard: Slovenske Lodenice Komarno a.s. / Komarno

Ship manager: WESSELS REEDEREI GMBH & CO KG, Haren (Ems) / Germany