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You're good...too good.
I believe you may be on to something with zombies being affected by Earth's magnetic field. The undead, due to injuries and decay, often lack eyes altogether, as has been discussed. With the sensitive microscopic hairs in the ears likely degraded as well and the observed lack of feeling (or at least a sense of pain) that zombies are known to have, this only leaves the sense of smell. Navigation by scent alone maybe help find prey, but for general shambling around a sort of internal compass would be most valuable. Perhaps with their other senses dulled the subtle pull of the poles becomes easier to recognize, giving the undead a point of reference by which to move.
This is bad news, by the way. As zombies are drawn northward they are likely to enter colder climes. Zombies which freeze in the winter are preserved from decay and can come back in the spring thaw, making total elimination difficult if not impossible.
With all this in mind, exiting the airducts from the north is still the best bet, as any zombies in the ducts would be drawn to it as well and are therefore behind me. Turning back would be suicide. With luck if there is a zombie ahead it too will be drawn north and hopefully stay ahead of me. Chances are an exit could be found before any zombies run across me.
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