this quest drives me batty. You have several levels get to using varies portals. It's a puzzle. I hate puzzles. Eventually I figure how to get to the 4th level by pure luck but I'll figure out the correct directions some day.
update: found via zam
north mzae
Z loc
---------
0 S
-90 E
-180 W
-270 E
-360 N
-450 N
-540 S
-630 E
-720 W
-810 E
-900 E
-1000 N
-1090 E
-1180 N
-1270 E