Waterspike, 15′ of rope, 10# anchor, 30-100′ of line to boat.
This setup is more effective than running a chain from your waterspike.
A bungee between your anchor line and your boat will also help to absorb the shock of waves hitting your boat and busting your anchor loose.
When conditions aren’t windy, just drop the waterspike without the 10# anchor 15′ behind it.