From [Memory Alpha][1]:

> The Picard Maneuver was born out of desperation during the battle. The
> Stargazer, which was damaged, suddenly accelerated into high warp
> directly towards the Ferengi ship. By doing so the Stargazer appeared
> to ship's sensors, for an instant, to be in two places at once. When
> data from the newly-moved ship reached the Ferengi ship's sensors,
> data from its previous position was still arriving, so the Ferengi
> effectively "saw" two Stargazers in different locations.

As I have recalled, the text is correct. This was told by Picard in an episode of *Star Trek: The Next Generation* TV series. And, in the end of that episode, when Picard tried to apply `Picard Maneuver` to attack USS Enterprise - D, it was shown on screen of Enterprise - D that Stargazer was at two places for an instant before it was stopped by tractor beam. The images from Memory Alpha:  
![enter image description here][2]  
![enter image description here][3]

How could Picard Maneuver work to confuse sensors of Warp era? Isn't it like we rely on light waves to see the Warping ship?

> When data from the newly-moved ship reached the sensors,
> data from its previous position was still arriving.

It seems to me like data transmission wasn't FTL. If it is, our sensors would never have been able to lock a warping ship's exact location. But, we have seen battles at warp speed & sensors detect something from light years away. What's special with `Picard Maneuver` which screws sensor readings (even that of a Galaxy-class starship)?


  [1]: http://en.memory-alpha.org/wiki/Picard_Maneuver
  [2]: https://i.sstatic.net/1JqP9.jpg
  [3]: https://i.sstatic.net/jUIdQ.jpg