Are you sure? Personal items normally only includes things within the home. So, if you back over in your driveway, you would be covered. If the Ocean was part of your backyard...I'd say you're covered.
BUT, unless there is something specific in the Policy that names the Phantom as being Insured-I wouldn't want to count on it.
Best to call and talk to an Agent that would be dealing with the claim, in the event you lost your Phantom in the Ocean, and specifically ask if your remote air vehicle is covered, away from your home. If so, I would get a Policy that specifically spells out the words Phantom Vision, and Covered for ???$$....just to be safe.
IF/When you fly into the Ocean, and call your Insurance Agent, is not the time to find out you were not covered.
Like I said a few posts up; some independent agents may provide this type of coverage. But, I would want it spelled out, just for CYA purposes.
I'm so glad you brought this up... I'm about to call and get detailed info as well as policy info... Stay tuned...