Its in the Spec
Humans do have a compass in the nose, it was in the original specification, and each unit does have the physical hardware.
However, our Marketing guys had an idea to increase the product lifecycle and revenues, they got us to disable the compass on the firmware of the Human-Unit, so we can sell "upgrades" later on providing this functionality.
We hope to be able to provide this upgrade as soon as our beancounters can decide how much the upgrade should cost should be for each unit.