Ok I've faithfully read all the posts regarding the empeg serial port and here's the understanding I got:
In order to connect a GPS, in this case an Oncore unit, I need to make a custom cable with no pins connected except 2,3 and 5 and 2/3 are crossed. So I took a perfectly good serial cable cut it, found the right colored wires by using a multimeter and connected them. I'm still not able to get GPSApp to see my GPS unit, it just says "Waiting for Data from GPS receiver"...
And yes I've tested this GPS unit fine under these circumstances:
My GPS unit works fine on my computer indoor, works fine on the empeg indoors
AND
it works fine on the empeg in the car using the serial port on the back (I connected the serial cable through the sled).

What other options do I have her? I guess I could recheck my serial cable again but I'm pretty sure I connected it right. Do I just need to pull the stupid sled out and bang away at this indoors? Any ideas?