[ntp:questions] Suggested gps devices for use as a time source for ntpd
hal-usenet at ip-64-139-1-69.sjc.megapath.net
Tue Aug 7 08:11:11 UTC 2007
>Now most of the nav units have usb connectors so I assume that's so they
>can be used for this purpose. I gather I also have to look for ones that
>support NMEA or PPS output is this still correct?
USB and timekeeping is not a good combination.
If you want good timekeeping, you want a unit with PPS. That
should get you within 10s of microseconds. Without a PPS signal,
I'd expect 10s of milliseconds.
>Any suggestions for gps nav units that support ntp on linux?
The best low-cost GPS unit that I know about is the
Garmin GPS 18 LVC. NB: You neeed the -LVC. The other
versions of the GPS 18 don't have PPS.
It needs a serial port and 5V power. You can get the power
from a USB connection. It's under $100. "Some assembly
required." (No big deal if you know how to use a soldering iron.)
These are my opinions, not necessarily my employer's. I hate spam.
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