#1 Protection for electronic equipment
To capture your trip or to use your GPS, you will be taking your smartphone with you on the water. To protect it but also to avoid dropping it in the water when handled, using a waterproof pouch is strongly advised. It will allow your smartphone to survive any splashes and even brief immersion.
And you can attach it to your buoyancy aid or around your neck using the cord and no longer risk losing it. Beautiful pictures and posts on your social networks at your fingertips!