if you're on the mission where u have to scan the gate, you should have just followed the saiien 2 that bret was in. but if u need directions here they are:
from Goner temple in cloudbase south west where the mission starts, go through the south gate to emperoro mines.
next head east throught the next 3 gates ending in preists pity.
head north to split fire
head east again to brennans triumph.
easy. hope that helps.