Quote:
Originally Posted by Paul C. Anagnostopoulos 
Not if you use the Earth's magnetic field as an inclination compass.
~~ Paul
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To use inclination - which gives you l attitude - you also need longitude. OK, in theory if the bird could keep exact track of time (even while anaesthetised), it could get that from the sun's position in the sky, but we may only be talking about a few tens or hundreds of miles, so the change would be very small. Do we really believe all that - after all, the US had to install a fleet of navigation satellites to make its cruise missiles work properly.
To me, this is an example of the "any explanation is OK just so long as it is conventional" school of thought.
David