Instinctive astrogation
From Wookieepedia, the Star Wars wiki.
Instinctive astrogation was a Sense-based Force ability that permitted the user to find a route through hyperspace that was fast and safe without the help of a navigation computer or astromech droid. A Jedi using this power would reach out with the Force to determine the safest path from the myriad possibilities available. With sufficient practice, this ability could be learned without formal training. The navigator for the pirate Drek Drednar, Tron Nixx, was unwittingly Force-sensitive and developed this ability through practice, believing it to be merely phenomenal luck.
An alternate Control-based ability, known as instinctive astrogation control, was a far more difficult and esoteric power. Instead of feeling out the correct path and related equations, Jedi would use the Force to enhance their mental abilities, allowing them to calculate the incredibly complex mathematical equations of hyperspace navigation in their heads. This was mostly used as a meditation and training activity, as the task was so difficult that even Jedi were prone to potentially deadly mistakes. It was known only to the most theoretically-minded of Jedi, including the Jedi mathematician Hart Daele. Daele wrote a doctoral thesis on this ability proving that the high-order equations could be solved or, under special situations, approximated using standard jedi meditation techniques.
Several alien species were also capable of astrogation without computers or the aid of the Force, including the Siniteen, Lucent, and Givin. The famous star dragons could not only calculate hyperspace jumps without a navicomputer, they could make the jump without a ship.
