I just downloaded, loaded the code, and flew the newest ArduPirateNG code from their trunk location on Google code. The new NG code supports the newest v1.6 GPS firmware and I get GPS lock on the CPU board. Yea!!! :-)
Test flew briefly in stable mode and it flew very well. I flipped into altitude hold mode and it quickly started to rise. Since it was dark out, I didn't want it to get out of the light from my flood lights on the house, so I flipped back to stable mode and flew around for a few more minutes.
Great job ArduPirates!
I really need to get used to how sluggish the yaw is on these quads. I'm used to good heading hold gyros on 600mm helis. That is a whole different world than the yaw an a quad!! 
At any rate, it's flying well and I need to get more acquainted with it!.
Check it the ArduPirate code!
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From your post, I have to assume I am *not* running v1.6 MTK code?
My GPS came with the FahPah (first batch) ArduCopters, and I'm running RC2 code. It works fine, gets lock, and so on. Is there a positive advantage to going to v1.6 and the Pirate code?
That's great news! Can't wait to upload it to my quad.
I think I found it before but can't seem to find it again ... so how do you know which firmware do one has on his/her mediatek gps unit?
Thanks.