Flying Over Water - Downward Positioning Sensors On or Off?

Exploring the topic of Downward Vision Positioning Sensors with the Mavic Pro and Phantom 4 Pro over water. Should they be turned on or off for the best and safest experience flying over water? My drone gear: http://www.EdRicker.com Buy the Mavic Pro: https://amzn.to/2VxluI1 Buy the Phantom 4 Pro: https://amzn.to/2ZX8FuM If you're looking to be a commercially certified drone pilot in the US, enroll in the Drone Pilot Ground School below. http://dronepilotgroundschool.com/?af... Get $50 off by using the code: RICKER50 Check out my video making gear at https://kit.co/EdRickerVlogs