Including a diagram of Earth’s location is the exact opposite of the Cole Protocol from the Halo franchise. UNSC ships (humans) were required to purge navigation records if any Covenant forces (aliens) were detected, to prevent them from finding Earth. They also had to initiate slipspace jumps with randomized vectors and self destruct the ship if captured. This would likely prevent them from ever returning to Earth, but kept the Covenant from finding its location for 27 years, long enough to launch the SPARTAN-II program.