How did this character fly this ship?

Question

In Star Wars Episode 9: The Rise of Skywalker, Rey flies Luke's old X-Wing, which has been under water on Ahch-To for a number of years. Assuming that the ship didn't suffer enough corrosion or damage that it was unusable, how did Rey manage to fly, let alone navigate, to Exegol without the assistance of an R2 (or R4, etc) unit?

My understanding is that droids did most of the take off/landing of the ships, navigation, targeting, and so on, leaving the pilot to pilot the ship and make the instinctual decisions. I know Luke flew back from destroying DS1 with R2-D2 severely damaged, but that was a short flight in comparison.

Answer 1

Although it's been confirmed (repeatedly) that the T-65B X-Wing Starfighter has no built-in Navicomp capability, we do know that Luke somehow managed to travel to Ahch-To without an Astromech droid given that we find R2-D2 rotting under a tarpaulin on Yavin IV.

Since the socket in the fighter is seen to be empty, the most likely option is that he retrofitted his ship with a simple Navigation Computer, noting that technology has moved on significantly since the days when Astromechs were required, to the point that even small First Order TIE fighters now have full hyperdrives.

It's also possible that Rey (scavenger par excellence) was able to cobble a working Navicomp out of components that survived the landing and subsequent bonfire of her TIE

Answer 2

I wondered this myself, but then figured that the Sith wayfinder device was what gave her the co-ordinates to get to Exegol. After all, that was the purpose of the device.

Obviously, this leaves the problem of Luke traveling to Ahch-To without an astromech to calculate the hyperspace co-ordinates. So, as suggested by other answers, he may have had the ship retrofitted with a navicomp. Or, he may have used the Force.