Would ships know they were being tracked by an approaching F-35?
Short answerIt depends on the radar generation and range; stealth is not an invisibility cloak, and radar designers continue working to detect the aircraft farther away.
NotesStealth does not provide complete invisibility. A ship's chance of detection depends on the radar technology it carries and the geometry and distance of the encounter. The F-35 remains difficult to find and therefore tactically valuable. Its success also makes extending reliable detection range a central objective for every radar programme facing it.