The present invention is directed toward a motorized watercraft. Also, when performing conversion from an input digital signal having an arbitrary number of samples to an output digital signal having an arbitrary number of samples, prior art methods entail the possibility that the memory capacity and the amount of computation may become enormous. Most specifically, this invention relates to the sample probe geometry, sample probe composition, and sample probe surface chemistries that enable the selective capture and desorption of analytes, including intact macromolecules, directly from the probe surface into the gas phase without added chemical matrix. Each pixel is addressed by a transistor. The two lines that are wound on the reel in the same direction extend around the guides while the third line extends between the guides and all of the lines being connected to each other at their distal ends.