Quote:
Originally Posted by Kevin527
This makes no sense to me because any functions that could interfere with airplane navigation can be disabled on the iPad and Kindle
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Firstly, as has been discussed many times in this thread, electronic devices will radiate when they operate, even when actual transmission systems have been turned off (be they cellphone, wifi, bluetooth or whatever).
Secondly, it's not just navigation systems which carry a perceived risk of interference - fly-by-wire, communications and many other safety-critical systems could conceivably be affected by EM radiation. Clearly, during take off and landing, the effect of any interference is likely to be more critical, hence a higher margin for safety is applied (turn off the device completely, rather than just turn off any radio modules).
Thirdly, despite it perhaps being very unlikely that the EM radiation from an ebook reader would cause problematic interference, unless you are professionally qualified to make that judgement it matters not whether or not it makes no sense to you (no offence!). What matters is that it makes sense to those who actually understand the technical issues.
/JB