Required pointing accuracy in azimuth is +/-1 degree at 10 meters (30 
feet) for a 15cm radius (1 foot diameter) target. Do you have a sensor 
that can manage that good ? (actually about twice as good to account of 
other error sources) ? I think not. Crossbow for example are rated at 
+/- 2 degrees.

http://www.xbow.com/General_info/gyro_guide.htm

Peter
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