In Star Wars: The Rise of Skywalker, when Poe and the others are discussing their plan to get to Exegol, Poe says:
FINN: As long as those Star Destroyers are on Exegol we can hit them.
BEAUMONT: Hit them how?
ROSE: They can't activate their shields until they leave atmosphere.
POE: Which isn't easy on Exegol. Ships that size need help taking off. Nav can't tell which way's up out there.
WROBIE TYCE: So, how do the ships take off?
POE: They use a signal from a navigation tower, like this one.
Do the features of the planet itself (the magnetic fields, etc.) just inhibit any meaningful determination of "up"?