I have a HS720E and have used it numerous times on shore. I have also taken it and flown from the deck of my boat at anchor in a very calm bay. I am trying to launch from my boat when offshore fishing several miles from shore. I have tried three or four different times and I cannot get the drone to calibrate or to launch. Batteries are charged and I am following the regular launch procedure. Is there a tip to launching when on a large body of water that anyone can share?