Always finds the right path.
Knowledge of the coastline, various ports, sea currents and star constellations. Good cartography skills are optional along with reading and writing. When navigating smaller fishing and merchant vessels those are not necessary, but if someone wants to eventually sail on bigger ships or even internationally, basic education is a must. It is usually provided by naval academies in bigger ports or while doing an apprenticeship on an official naval vessel.
This is the best starting point for anyone who wants to become a captain of his own vessel or who wants to quickly ascend through the navy ranks.
Navigators are trusted by their captain and crew and are treated as such. If there's shortage of supplies, food or men on board; navigators tend to be the ones least affected by these circumstances as everyone wants their brain working on hundred and ten percent, so they can get them to a safe place to resupply. Also, if you are a navigator you are the person that gets the least harassed, no matter your gender, ethnicity or social status.