SPACECRAFT GUIDANCE

	The attitude and translational control of the USS Enterprise relative to 
the surrounding space involves numerous systems aboard both the Saucer 
Module and Battle Section. As the starship maneuvers within the volume of 
the galaxy, the main computers attempt to calculate the location of the 
spacecraft to a precision of 10 kilometers at sublight, and 100 kilometers 
during warp flight. The subject of velocity is important in these discussions, 
as different sensing and computation methods are employed for each flight 
regime. During extremely slow in-system maneuvering at sublight velocity, 
the main computers, coupled with the reaction control thrusters, are capable 
of resolving spacecraft motions to 0.05 seconds of arc in axial rotation, and 
0.5 meters of single-impulse translation. During terminal docking maneuvers, 
accuracies of up to 2.75 cm can be maintained. Changes in spacecraft 
direction of flight, relative to its own center of mass, is measured in bearings.

	Internal sensing devices such as accelerometers, optical gyros, and 
velocity vector processors, are grouped within the inertial baseline input 
system, or IBIS. The IBIS is in realtime contact with the structural integrity 
field and inertial damping systems, which provide compensating factors to 
adjust apparent internal sensor values, allowing them to be compared with 
externally derived readings. The IBIS also provides a continuous feedback 
loop used by the reaction control system to verify propulsion inputs.  Æ