The chinese GPS is also not so accurate. Even India has acquired this tech thru Israel only.
And what about their access to US military grade P(Y) signals from GPS? And if India jammed the gps which is possible by jamming the P(Y) signals then it might have caused the deviation. But I suppose there was no such jamming.
By the way I have not analyzed nor read them , but it's known to the engineer community related to Satellite comm and C/A designers that the Chinese signals are powerful and accurate if not very accurate.
The below is the article from April 9th states that M code will be available once it's ready so it means that Pakistan had access to the military grade P(Y) signals for nav?
New military code about to board 700+ platforms - GPS World
Will M-code be made available to other friendly nations? If so, how is this managed?
GPS Directorate. The current policy allows for the sale of M-code equipment to all 57 authorized GPS PPS nations. The M-code technology will be made available to these nations through the Foreign Military Sales process.