How do you open the eagle files?
Download completely free eagle CAD http://www.cadsoftusa.com/download-eagle/?language=en
This is pretty much the standard since it's been free forever for non-commercial use. They have a very fair licensing system which is why it's so popular. You are only limited to board size and number of layers to make a new board in the free version but you can open any existing design no matter what.
Thanks Vermont. That was helpful. I was wondering if I could interface a UART camera sensor (CMUcam4) specifically via the GPS UART on the ardupilot mega 1 board since I am not using it at the moment.
I did this on saturday but only got my arducopter unable to arm the motors afterwards. Also, I could not establish a connection to the mission planner as I got "no heartbeats packets received."