[QUOTE=GBO; the speed observed on primary radar from Penang to the last primary radar point at 1822:12, will equate to the aircraft being too far west of the 1825:27 BTO arc (satellite data).
Using THEIR thinking, then the only way around this is to disregard the 1825:27 BTO arc and use the 1828:06 BTO arc [/QUOTE]
This is an example of taking one bit of information and using it -- incorrectly -- to build a pillar for a preferred theory. To suggest that the "only way around" the speed observed on primary radar is to disregard the 1825.27 BTO arc divulges an ignorance of primary radar -- especially that particular primary radar.
Grizz