Related Clues:

• Front-line M.D.'s
• Sub's 'ears'
• Item on a sub
• A.M.A. members
• Echolocation device
• Destroyer detector
• Docs
• Salvager's system
• Some docs
• Shade of white
• H.M.O. listing
• Whale finder
• Navigational aid
• Navigational system
• Source of waves at sea