Related Clues:

• Staff, at sea
• Rise and fall of the sea
• Maritime phenomena
• Weather-page stats
• ''Titanic'' extras, perhaps
• Helps enough to keep going, with ''over''
• Sea movements
• Sea motion
• Phenomenon measured by a marigraph
• It's high part of the time
• Geophysics topic
• Team on the Thames
• Subject of some tables
• Yacht staff
• "Enterprise" personnel