[rcpilot-site] Compass

[BALAJI.V <vba...@ya...>]

Hai everybody,
     I am new to this field of UAV. After going  through some documentations available on the internet, I have  some doubts.
 Why do I really require a compass, if I am using 3  gyros for 3 axis of rotations pitch yaw and roll, and 3 accelerometers for x,y,z  directions? 
 What do heading really mean? 
 What will be the output of the  compass?
 Thanks in Advance
 Balaji.V

 				
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