[TigersEye]

It is moving forward at 10 miles a minute. It certainly isn't moving sideways that quickly.

Then why does the multiple picture overlay show it making far more progress sideways, to the south, than forward, to the east?

[Rokke]

"Then why does the multiple picture overlay show it making far more progress sideways, to the south, than forward, to the east?"

It doesn't. Can you tell from the picture what the course of the airplane is? The orange line shows it moving along a consistant course. Do you know what heading that course is?