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Don't worry about the magnetic field from the battery cables running along
the floor of the cockpit - even if they are split up like mine are.

The magnetic field produced by a single conductor is proportional to the
current and inversely proportional to the distance from the conductor. Your
mag compass is far enough away that it should not be a problem. Also, those
battery cables are carrying a high current only during cranking the engine,
when you don't care about your mag compass reading.

If you want to ease your mind about this, perform a simple test. Get
yourself a cheap magnetic compass and hold it near to the battery cables of
your car while someone else is cranking the engine. Then hold it 24" away
and see if the needle still swings.