Government sites

• National Weather Service
• National Hurricane Center
• Joint Typhoon Center
• United Kingdom Met Office
• National Data Buoy Center
• Japan Meteorological Society

Satellite images

• Satellite Imagery (US and World Wide)
• Realtime Satellite Images (Europe) 
• World wide satellite images 
• Africa (including Western Africa)

Unique sites

• Marine Traffic
• Sunrise and Sunset Calculator
• Tide Predictions
• Gulf Stream Information
• Ocean Currents
• Wave Calculator

Tropical Cyclone Information

• Tropical cyclone Spaghetti model info