Related Clues:

• Letters in the sand?
• Signal for help
• ''Mayday!''
• USCG alert
• Request to be rescued
• Morse message
• Help wanted letters
• 'Help!
• Maritime distress call
• Nautical ''Help!''
• One might be received on a bridge
• 'Help wanted' letters
• It may be tapped out at sea
• Signal meaning ''help''
• Worrisome letters to send