Buzzing from afar

I took a run the other day and as I was heading out I noticed a sound off in the distance that sounded a lot like a router. Not the network switch kind, the thing that makes pretty edges on pieces of wood. Another analogy would be the sound of a finishing sander, a high pitched buzzing varying slightly. If none of this rings a bell then just picture a buzzing and you'll be close enough. Back to the main point, the sound was coming from what sounded like up the hill in front of me. The funny thing is the closer I got to the source the more upwards the sound was coming from and next thing i know the sound is behind me. I never passed anyone doing construction. And wood work is pretty rare around here, (everything is tin and cement). So I was a bit baffled. Stopping and turning around in slow circles i determined a basic direction of the sound and followed it up, and up, and up... remember this is Grenada. With the exception of the government building and campus I have yet to see anything more the three stories and I was running through a very poor area which was nothing more then tin shacks so sound coming from up high was very bazaar. Following the noise upward I came to a kite. This kite was your standard diamond shape kite, except that it was probably about 3-4 hundred feet up in the air. I was quite impressed.
In the Caribbean we get what is called "Trade Winds" essentially consistent winds that never seem to die, especially a few hundred feet up. I now hear this same noise from multiple directions pretty frequently. I can almost never see the kites but i know they are WAY up there some where. The interesting thing is, the locals seem to just leave them up there. I just took the dogs for a walk at 11pm and I could hear at least two or three that have been flying for the past day or two still going. I just noticed today that there are now multiple kites in the local stationary store. Perhaps this is a seasonal trend or just a fad but either way it's unique. There isn't anywhere in CA that I know of that you can toss a kite into the air, send it sailing hundreds of feet into the air and leave it up there for days...