Thread: Keeping ducks off a boat!

There were yachts moored at Taupo (eastern side on edge of town) that used to be piled high in poo from ducks, shags, geese etc. I see they now sport little spinners like tiny radar units (think a metre dia). About 3-4 per boat. Wind powered. Clean looking boats now.
Others use comercial bird netting from orchards. But would be a bugger deploying and retracting. Depends how often the boat gets used?