This article proposes a method to estimate a ship's relative heading against the waves. The procedure relies purely on shipboard measurements of global responses such as motion components, accelerations and the bending moment amidships. There is no particular (mathematical) model connected to the estimate, and therefore it is called a 'blind estimate'. The approach is in this introductory study tested by analysing simulated data. The analysis reveals that it is possible to estimate a ship's relative heading on the basis of shipboard measurements only.
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