SUP Safety Whistle
This is a simple whistle that you will need to have on your board/you along with a coast guard approved PFD when your paddling. The current Coast Guard regulations require that you carry both items with you on every board. You want to be able to signal to larger boats when out on the water. They have the ability to ticket you for the PFD and the Whistle so its well worth the small investment to make sure your safe and in compliance.