Glossary ======== .. glossary:: CFE Closed-Form Expression. DTU Danmarks Tekniske Universitet / Technical University of Denmark. DWS Directional Wave Spectrum. EMEP Extended Maximum Entropy Principle. IMU Inertial Measurement Unit. JONSWAP Joint North Sea Wave Project FIFO First-In/First-Out. NED North-East-Down PSD Power Spectral Density. RAO Response Amplitude Operator. SAWB Ship-As-a-Wave-Buoy SSE Sea State Estimation. An ensemble of methods and techniques used to characterise the ocean wave system at a given time and position. std. Standard deviation. WBA Wave Buoy Analogy