By the way, if you stop and think about it, you'll realize how much effort it is to "stay in one place" if you have some kind of anti-gravity drive. For instance, right now, I'm sitting at a Starbucks in New Jersey. From my point of view, I have not moved during the last 8 seconds. And yet, planet Earth just moved front-to-back over a point on its orbit around the Sun. And the Sun is rotating through the galaxy at about 40 kilometers per second. So long as you are constrained by gravity, you don't have to worry about this. But what if you had an anti-gravity drive, such that you never experienced gravity? Can you imagine the incredible effort it would take to remain in a "stationary position" if that position was, from your no-gravity perspective, moving very fast, in several dimensions? That's why this jumped out at me:
"The craft was jumping around erratically, staying over the wave disturbance but not moving in any specific direction"
We should exactly expect a craft to be "jumping around erratically" if it has an anti-gravity drive, yet is also trying to stay over "fixed position" relative to another object that is rapidly spinning (the Earth).
And boiling or frothy water is, again, exactly what water should look like if it is being effect by anti-gravity:
"The disturbance looked like frothy waves and foam, as if the water were boiling."
If you could wave a magic wand and make all gravity on Earth stop, the ocean would rapidly disappear into space, and as it did so it would look as if it was boiling.
"The craft was jumping around erratically, staying over the wave disturbance but not moving in any specific direction"
We should exactly expect a craft to be "jumping around erratically" if it has an anti-gravity drive, yet is also trying to stay over "fixed position" relative to another object that is rapidly spinning (the Earth).
And boiling or frothy water is, again, exactly what water should look like if it is being effect by anti-gravity:
"The disturbance looked like frothy waves and foam, as if the water were boiling."
If you could wave a magic wand and make all gravity on Earth stop, the ocean would rapidly disappear into space, and as it did so it would look as if it was boiling.