There are plenty of fancy drones on the market. Not many of them are designed to withstand prolonged exposure to water. The Gannet Pro drone is ready for fishing and search & rescue missions. It can fly in heavy rain and carry payloads up to 3.5kg.
This drone has fully sealed electronics and failsafe elector-mechanical payload release. The Gannet Pro+ can fly for 20 minutes and has max speed of 60km/h.