Coit,
Backin' up tobz on the tas issue, have seen it in the 380's often.
iss7002,
If it uses radar data at all it does a very bad job. One of the other problems with the FPOFS (Farkin' Piece Of French Sh!t) is you 'lock in' an estimate for the fix, and the FPOFS keeps re-calculating the estimate and continues to change it. Then you change it back and then it changes it back and then you change it back etc etc etc.