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object object catalog obscuration obscured sky obscuring phenomenon Observed Height occluded front occlusion occulting light Ocean Passages for the World Ocean Prediction Center offset offshore wind okta old ice omega block on the beam on the bow on the quarter One-Two-Three Rule (1-2-3 Rule) onshore wind opacus open array open pack ice OpenCPN optimum weather routing ordinary practice of seaman orographic rain OSCAR overcast overtaking overzoom own ship

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