The Canadian Navy is exploring operator guidance systems designed to promote safer and more efficient operations in a seaway. These systems require accurate real time information on the local sea state. Recent sea trials with a wave radar system, which can produce directional wave spectra from the back scatter produced by conventional navigational radar, have generated good direction and frequency measurements, but wave height was found to be less reliable. However, by combining the wave radar measurements with ship motions, these wave height measurements are greatly improved. This paper presents some background of at-sea wave measurement, a description of the combined wave radar / ship motions procedure, and the results from several sea trials.

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