This will use data about a previous solve to provide rapid, low overhead movements (without the need for a full centering process).  This means that, unless some type of action that performs a plate solve of the scope's current position (solve and sync, auto centering or center here) has been performed, this option will not be available.  Once it becomes available, you can use it in a much more expedient manner because it does not require the full centering process with solving and subsequence verification.  The validity of this action is highly dependent on your mount's polar alignment and ability to slew in a precise manner.