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Starpath online classroom
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Marine Weather Glossary
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obscuration
obscured sky
obscuring phenomenon
occluded front
occlusion
Ocean Passages for the World
Ocean Prediction Center
offshore wind
okta
old ice
omega block
One-Two-Three Rule (1-2-3 Rule)
onshore wind
opacus
open pack ice
OpenCPN
optimum weather routing
orographic rain
OSCAR
overcast
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