Supercruise
Supercruise is a method of "fast travel" within plantetary systems.
Activating Supercruise
Select a target within the current system via the Target Panel
Use ENABLE SUPERCRUISE control to engage super cruise.
Once Frameshift Drive is charged, throttle up to engage super cruise.
Use flight controls and throttle to manoeuvre at super cruise.
Maximum super cruise speed is determined by proximity to stellar bodies.
Use ENABLE SUPERCRUISE control to disengage super cruise.
Supercruise cannot be engaged if your ship is mass locked (i.e. too close to a large body of mass such as stations or planets), has its landing gear down, or has cargo scoop or hardpoints deployed,
Note: It is possible to Supercruise to other stars, but it'll take you several days, so use Hyperspace for that
Much of this is currently taken from Fangrim's Guide to Supercruising the Easy Way [1] on the official ED forums. Supercruise is currently in an early development iteration so is subject to significant change.