Do you plan on flying a quad copter? Well, what if you could stream in data wirelessly?! Then you could replay your quadcopter in 3D motion and track its battery data over the course of your flight. This will mainly comprise of wirelessly connecting to the ardupilot mega (APM) quad copter through an XBee connection. One XBee will be connected to the computer and the other will be connected to the telemetry port on the quad copter. Follow the following wiki page for instructions on how to construct this: http://copter.ardupilot.com/wiki/xbee-radios/
Now that you have fully hooked up your XBees and quad copter, now we can talk about MavLink! MavLink is a software program that takes input data from the XBee and determines location, speed, GPS location, etc. for the quad copter. Follow the link for instructions on installing MavLink and follow the tutorial to learn about all the cool things it can do! http://qgroundcontrol.org/mavlink/start
When you start MavLink, your window should look like that of Figure 1.