Results of sensing seawaters with a shipborne UV laser are presented. Measurement techniques and instrumentation were developed at the Institute of Oceanology and the Electrotechnical Institute. Instrumental constants were determined by calibration. Equations have been derived that connect Raman signals, fluorescence of oil products and chlorophyll in various spectral regions, and laser pulse energy with the concentration of dissolved organic matter and oil products, concentration of chlorophyll, and the value of the optical water type index. The distribution of the oil products and chlorophyll concentrations along the ship routes during research missions are mapped.