I'm not sure what you mean by "delayed". Retrieving it from a web service might be delayed, but if you've got a radio receiver on the ground it's going to be pr

I'm not sure what you mean by "delayed". Retrieving it from a web service might be delayed, but if you've got a radio receiver on the ground it's going to be pretty close to real-time. Plus, since they don't turn on a dime, doing motion prediction would be pretty straightforward.