Alcohol is banned as a performance-enhancing drug for some things like shooting.

tl;dr:

They suggest this indicates that rather than such skills coming about via evolution, it is more likely due to cultural differences, such as males being taught to navigate while females are not.

The researchers state that in most modern societies, boys tend to roam farther from home than girls, due to many factors, including fewer constraints and personal safety issues. Due to behavioral issues, boys are much more often encouraged to play outside, where their playmaking can lead them to roam to places far from home. Quite often such activities are conducted with male peers, allowing the group as a whole to improve their navigational skills. T

tl;dr: practice provides an 18-26% improvement, and the rest I guess is just natural talent?