Related Clues:

• Floats
• Encourages, with 'up'
• Elevates
• Harbor markers
• Harbor sights
• They barely keep their heads above water
• Ocean channel markers
• Keeps afloat
• Lifts
• Harbor floaters
• Raises, as spirits
• Sea bobbers
• Lifts, as spirits
• Lifts up
• Some meteorological data collectors