How to navigate stealth fighters?

It is mainly done by satellites and early warning aircraft. Ground radar doesn't help much. It's a backup system.

The navigation system of F 1 17 consists of IBM's AP- 102 mission computer, GEC- Marconi's flight control computer/navigation interface and autopilot computer system, and Honeywell's SPN-GEANS inertial navigation system (H-40 from 19 1

The B-2A is also equipped with an advanced NSS navigation system. The system includes two kinds of navigation equipment, one is inertial navigation unit, and the other is NAS-27 astronomical navigation unit, which provide advanced automatic navigation and the most commonly used constellation positioning navigation for B-2A respectively, thus ensuring flight safety. The target aiming system on the plane adopts the global positioning auxiliary aiming system, which can lock the selected target and enlarge it by four times, which is convenient for the crew to identify and aim at the target, thus improving the hit accuracy of the bomb. The error of a bomb hitting the target is usually less than 6 meters. The B-2A is also equipped with an electronic warfare system of APQ-50 model. The system can not only provide radar early warning for aircraft, but also quickly detect the azimuth coordinates of enemy radar.