Oh man. I went on a Southwest roadtrip with my wife. We had an appointment to tour Canyon de Chelly with a Navajo guide on Sunday AM. We checked into a motel j

Oh man. I went on a Southwest roadtrip with my wife. We had an appointment to tour Canyon de Chelly with a Navajo guide on Sunday AM. We checked into a motel just barely on the reservation on Saturday night before the DST change. When we entered Arizona, it was, I think, on different time from California. But that night, California was going to move onto the same time as Arizona. The Navajo reservation, too, would be changing times, to match Central, I think. My new-to-me car, with a "DST" box checked on the Nav system, and with the theoretical capability to change timezones based on location and DST rules, would do god-knows-what. We of course had to assume our appointment would be on Navajo time, but had no way of knowing whether our cell phones would switch or not, because there was no way of knowing whether there was GPS-based timezone logic, how precise it was, whether timekeeping was only based on the tower you're connected to, and whether the towers in question were on the reservation or outside of it. Needless to say, we actually set the bedside alarm clock and used it. (of course, these things often go awry as you find out you set it on radio instead of buzzer, and the radio is not tuned to a legitimate station, or the volume is too low, or whatever). Oh and I later found out the checkbox on my car just literally meant "are you on DST or not". Yeah, even though it has the capability to pull time from the satellites and cell towers, and even though it knows where I am, and in fact WOULD set the clock from GPS, you had to manually set the timezone and current setting of DST as you moved on and off DST.