In message <[email protected]>, "Clive D.W. Feather" writes: >Poul-Henning Kamp said: >> Using a GPS-UTC delta from memory, before we have an updated value >> from the sats is just plain old bogusly wrong. > >Disagree. > >I've got a GPS receiver here. It reports UTC so, I presume, uses a stored >delta until it picks up a new one. For the uses I have for it, an error of >1 or even 5 seconds (but not 30) is far more useful than "no data".
In all likelyhood, it stores the almanac in a cmos-ram chip that also contains a RTC clock. And if so, fine, it can do the right thing. The problem is where you don't have that possibility, for instance if the GPS is mast-mounted (temperature would kill the batteries, and replacement would be a PITA), or as Warner has had to deal with: spare-parts sitting on a shelf for 5 years before they are used (by that time your Almanac is expired many times over). -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
