Sequential multi-sensor satellite images from Envisat ASAR and WiFS are used for the computation of mesoscale surface currents in the Northern and Southern Baltic Proper. Different marine surface films and accumulated algae at the water surface are imaged by the sensors working in the optical, infrared, and microwave part of the electromagnetic spectrum and can thus be used as tracers for the local motion of the sea surface. Taking advantage of the sufficiently short time lags between the multiple image acquisitions (from less than one hour to one day) and of the high spatial coverage we calculated surface motion fields by enhancing and combining image-processing techniques. In some cases, data from sensors working at different electromagnetic bands (e.g., Landsat TM and SAR) can be used to apply high-speed feature-matching (cross-correlation) techniques for motion detection. Our computed two-dimensional surface current fields are compared with, and they complement, existing data from numerical models.