But we have no evidence that their destination is True North rather than magnetic North, or that the two are different in this world, or even that the compass is magnetic, rather than a magic item made with the Know Direction spell.
We don't even know that "True North" even exists in this world. Perhaps the world is stationary and the sun revolves around it. Then True North, defined by spin, wouldn't even exist (although it could be defined by the rotation of the fixed stars around the earth -- if the stars are fixed in position relative to each other).
[And it wouldn't surprise me to learn that Julio had a special compass made that always pointed to the next destination.]
Elan, we're going to Magnetic Santa, not True Santa.