I expect they had some kind of brain built-in 'compass' otherwise they'd not live very long (e.g. wandering into another critter's territory, and getting attacked - for dinner!)
I imagine, that the liquid core of the Earth might well wobble, when, whatever it is surrounded with would constantly be re-forming, and re-melting, maybe it is controlled in some way by what happens at the outer surface of the crust (earth) of the Earth, by the influence it may have of any variable gravity effects? (Wonder if anyone has carried out any study into 'variable gravity effects' that might happen on the surface of the Earth?)
Only slightly.
In 2009 the European Space Agency launched the GOCE satellite which went into orbit to obtain accurate measurements of ocean circulation and sea-level change, and carried a highly sensitive gradiometer to measure the variations of the gravity field in three dimensions. The data collected will provide a high-resolution map of the 'geoid' (the reference surface of the planet) and of gravitational anomalies.
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