Approach plates. Open an approach's FAA plate and read every named fix beside it at the altitude cold air makes it. Plates you have opened stay cached for the cycle, so they are there without a signal. Uncorrected altitudes now say why — a segment the Individual Segments Method excludes, a procedure that codes no reference altitude, an altitude ENR 1.8 never corrects — on screen and under VoiceOver. Airport lists mark cold weather: a filled badge where the restriction is in force in what is being reported now, outlined where a station reports above it. Siri and Spotlight open an airport or an approach by name. Nearest fills as soon as you allow location, and tracks at flight speeds. The display stays awake while the fix list is showing. Expired nav data is caught on launch and the current cycle offered.