Because of high reflectivity of water and the lack of fixed features, I would recommend using IR-LOCK:
https://ardupilot.org/copter/docs/precision-landing-with-irlock.html
Because of high reflectivity of water and the lack of fixed features, I would recommend using IR-LOCK:
https://ardupilot.org/copter/docs/precision-landing-with-irlock.html