drones! I sailed with a guy who used a kite to take videos of the boat under sail. I guess drones are a higher tech way to do that. And yes, streaming video can come from a lot of sources but at some point in time it has to have come from the
internet unless you are
buying DVD's and copying them onto some other medium. If you are cruising the islands you may only rarely come into range of a connection good enough to do this in a reasonable amount of time (or at all).
My other point was that ipads require some other device for
storage while many other types of tablets have an SD card slot which solves the problem. 128 GB cards are pretty
cheap nowadays and you can get them as big as 256 if you want. A very compact way to transport a lot of stuff. And in honor of not putting all your eggs in one basket, if one SD card goes bad you still have all the other ones with you. Not so with, e.g., the hard drive I use as backup at home.
But there are a lot of ways to do this. Usually it starts with whatever
equipment you already have.