The POSYDON Sea Exercise 2017 occurs in the Middle Atlantic – New York Bight Region for the first two weeks of February 2017. In collaboration with the POINT team, our objectives are to utilize the MIT MSEAS system to: (i) forecast the probability of high-resolution ocean fields using our ESSE methodology; (ii) transfer the corresponding distribution of the sound speed field to three-dimensional underwater sound propagation uncertainties; (iii) collect sufficient data to evaluate the accuracy of the Bayesian tomographic inversion and of its posterior estimates of range between transducers and sound velocity profiles (SVPs). Please visit the POSYDON-POINT webpage for more information.