@Divemaster wrote:
Have 70D with correct setting for 24HR date/time. When syncing pictures with GPS found that the Hex files were 56 minutes off. There does not appear to be any setting for daylight savings time that would interfere.
Has anyone an idea of why this would happen?
The following is probably entirely irrelevant, but I think it is potential insight as to why your GPS may not adjust itself for daylight savings time.
I used to design, install, and startup closed circuit camera systems in places like department stores, courthouses, and jails, for starters. We would almost never set the systems to adjust for daylight savings time. Why?
Because when you go to court with a videotape with a time stamp, one of the first questions that come up is the accuracy of the time stamp. The "keep it simple" principle prevails in these scenarios. It is far simpler to maintain the same time year round, and never adjust the time. All that is needed is documented procedure and schedule to check and/or update the time at the system's head-end, or master clock. You also need to keep a set of records of completion, demonstrating that the clock has been regularly checked and updated. Let's ignore the skill level of the people who perform the work, because that isn't germane.
Once you begin adjusting your clock for daylight savings time, you will need the same sort of documentation and records of completion. Daylight savings time isn't the same in every state and location in the country. Thanks, to Congress passing laws to alter the date of time change, even daylight savings time changes, requiring a rewrite of the procedures. Worst of all, there is the issue of when time falls back an hour, and you get a repeat of the 1AM hour. How do you document which hour you are looking at? For national store chains, the procedures would vary from one time zone, or state, to the next.
It is far, far simpler to just simply stick to standard time year round.
[EDIT] I, too, am uncertain as to what you mean by "hex file." As for your time being off by 56 minutes, it is probably safe to assume that the GPS time is correct, and the time on the camera is not correct, and requires an update.
If the time is still off by a curious amount after updating the camera;s clock, then it is possible that your GPS needs an update. Most GPS satellites in the sky were placed there by the U.S. It was found that upstart nations were using GPS data from satellites in self-guided missles. Congress passed a law changing the way GPS satellites would connect with GPS devices.
If the GPS device were moving too fast, then it would lose communication with the satellites. GPS units would not switch to new satellites as fast as they used to, which becomes a critical problem for a missile. So the next time your GPS loses its' signal and seems to take a long time to re-acquire satellite signals, that is probably no accident, but by design.
For consumers, this meant the every GPS device on the market would become obsolete overnight, not unless an update was performed. Seeing how GPS devices periodically update themselves, this was not perceived to be an insurmountable issue. But, it does mean that many older units may be out there that were never updated. This change took place sometime between 2008 and 2012.
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"Fooling computers since 1972."
