Possible Clues:

• Sounds as if Cathy's got them for sale
• Regatta boats
• Stop raising putting central heating in boats!
• Cathy's there for sale, it sounds for them on water
• Pricey craft
• Regatta entrants
• Cathy's able to make it to the sales of them, by the sound of them
• Cathy's for sale by sound
• Pleasue boats
• You can see them at marinas