Editing 1st Marine Expeditionary Force (section)

===Warp speed===
Transporters were not allowed to be used while a ship was at warp speed because of the severe spatial distortions caused by its warp field. (TNG|The Schizoid Man) Transport at warp was highly dangerous and had been attempted safely only a handful of times. (TNG|The Best of Both Worlds|The Emissary) There were, however, ways to circumvent this limitation.

* If both ships maintained exact velocity (i.e. the warp field on both vessels must have the same integral value/factor) transport at warp speed was possible. Failure to maintain the same velocities would result in severe loss of the annular confinement beam (ACB) and pattern integrity. 
* If the ship was traveling at warp speed and the object to be beamed was stationary, transport was possible by synchronizing the ACB with the warp core frequency. This would cause difficulties in obtaining a good pattern lock. The Maquis were known to have used this method. (VOY|Maneuvers)

"Near-warp" transport was also possible, but required extensive adjustments to the transport procedure.  It involved the transporting ship energizing its transporters at the same time as it dropped out of warp for just long enough for the matter stream to be transmitted.  The ship would then immediately jump back into warp. 

Persons who had experienced this form of transport remarked that there was a sensation of being merged with an inanimate object briefly before the transporter beam reassembled them. (TNG|The Schizoid Man)

:''Near-warp transport has also been referred to as "touch-and-go downwarping".''