rgbrock1
I'm not sure either and the studies are inconclusive.
if you wish to be pedantic, the reason an iPod must be off for t/off and landing is that the regulatory authority says so, because it may interfere....
Now there may be a regulatory authorty out there that does not take this view, but it does not regulate the airlines I use.
The pragmatic approach is that it may interfere, so keep it switched off when directed and I support that.