Hello, may be a bit late answer. But I use my MPP above water more frequently than grass.
Things to keep in mind :
If you are onboard, for the pilot :
- RTH point must be set to the remote and Hover as soon as possible
- Fingers on joystick may be hardly disturbed by waves and/or other boats speeding nearby
- no trees to block sunlights, hard to see video and use Zebra to correctly set the exposture
- distances are sometimes difficult to appreciate due to low level mist
for the drone :
- low altitude is hard to maintain and you must correct it, sensors behave weirdly when near surface and the drone climbs or falls suddenly ( I fly under 1meter frequently)
- wind is unpredictable and power consumption hard to estimate
- RTH needs at least 10% power more to take time to stabilize when wind and boat are jerking...
- water is a mirror that could reflect the sun just like snow and alter color balance and luminance data
- in low altitude above calm water and in a go forward trajectory, the surface should reveal the rotor's turbulences, idem for the grass if in river.
- BEWARE of birds, I got disturbed many times by seagulls, really really close to the drone... and even they do not attack, they rot the footage
- do not hesitate to repeat the same flight with 10 meters more or less, photographic perspective of shore is a bit hard to get.
you can see 2 youtube on
my page sea and river (really close and really high both).
I hope this helps