Flight MH370 researcher used radio distortions to track plane

On February 20th, 60 Minutes Australia interviewed retired aerospace engineer Richard Godfrey, who presented new evidence on the disappearance of Flight MH370. Godfrey analyzed radio wave disturbances caused by the airliner, revealing a manually controlled flight path. His findings suggest the plane made a 360-degree loop off Malaysia's coast before heading towards Antarctica. Godfrey speculates the pilot may have communicated with Malaysian authorities during this time. The plane ultimately crashed 2000 kilometers west of Perth, Australia, in an area known as the 7th Arc.

Where did the plane reportedly crash according to Godfrey's analysis?

What is the significance of the area known as the 7th Arc in relation to Flight MH370?