Related Clues:

• Boater's urgent signal
• "Get me out of here!"
• "Mayday!" letters
• Distressed dispatch
• “Help!”
• "We need help!"
• Letters spelled out with rocks on a desert island, in cartoons
• Big letters on an island beach, maybe
• Letters read from a rescue plane
• Letters requesting help
• Help signal
• Letters that shouldn't be written big for air rescue (a single V or X is best)
• Morse "Mayday!"
• What a flare may mean
• Brief alarm?