 Geophysical models are essential for predicting the trajectories of floating objects like oil slicks. Ocean Ensemble Prediction Systems, EPS, can provide comparable results to more detailed deterministic models when it comes to simulating oil slick drifts. The EPS also helps to account for the uncertainties associated with the models by taking into consideration the ocean's effects. This article was authored by Victor de Aguiar, Johannes Roars, Anna Malin Johansson, and others.