On 07/14/2012 06:47 AM, Brooke Clarke wrote:
Hi:
The key thing GPS is lacking is Daylight Savings Time.
WWV & WWVB have the DST bits that allow a clock to show the local time.
One reason GPS doesn't have it is that it is not coordinated globally.
For instance, US is not shifting DST at the same time as Europe. There
is no obvious "right" here.
Keeping track of the time-zones and their changes keeps the time-zone
folks alert and requires a constant maintenance. Keeping it in the GPS
signal would require mapping of position to time-zone area, and only
then it could be keyed down. These mappings does not stay stable, so any
downlink format would need to describe them and would take considerable
time. This is why it is best managed by the user himself.
Cheers,
Magnus
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