Pathfinders

Pathfinders ignore difficult terrain and any cover save they use is improved by +2 instead of the usual +1 conferred by the Stealth rule.

After both sides have deployed (including infiltrators), but before the first player begins his first turn, any scouts may make a normal move. This is done exactly as in their Movement phase, except that during this move, scouts must remain more than 12" away from any enemy.

If both sides have scouts, the players roll-off and the winner decides who goes first, and then alternate moving these units. 

If a unit with this ability is deployed inside a dedicated transport vehicle, it confers the scout ability to the transport too.

This rule also confers a special outflank move to units of scouts that are kept in reserve.