Total and utter bollocks, those guys trained for a very long time and had some provision for manual control had it ever been needed.Thats all possible only with auto pilot, even then its very difficult in zero G and that kinda alien environment.
Again, utter bollocks - or do you believe no-one flew airliners before GPS arrived?At little jet burst here and a little there makes a huge variation on the end result of a space craft, thats why people use GPS even for airliners.
GPS is used in civilian applications because it is available and it takes a lot of donkey-work out of navigating, but it is NOT a sine qua non.