Here is a waterproof quadcopter that can take off and land on water. The IdeaFly Poseidon 480 is IP68 rated and can fly for up to 40 minutes. It comes with a radio station with a 7″ screen and a 3-axis gimbal for smooth performance.
The device has a max take-off weight of 3.8kg. It comes with a 16MP camera, Bluetooth, and max vertical speed of 6 m/s. It can be used as a fishing tool. Costs under $1500 at this time.