> Are there rules about electronic stuff running on
> planes?


Yes, although I believe they are largely defacto and usually are concerned
with high energy devices or purposeful RF radiators. Use of eg laptops is
standard and thees can have significamnt em output.

Temperature loggers travel the world regularly. A common feature is their
very low battery drain and attendant very low em radiation (some lower than
others). My device runs for over 5 years on a single large flat 3V Lithium
cell.
It draws under 1 uA sleeping wnd is woken up by the RTC chip when readings
are to be made when it draws not much still :-). I suspect it would have
less radiation output than some wristwatches, PDAs or pocket calculators.


        RM

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