If ZDA isn't implemented or supported then you are really out of luck as the time from the GPS could be out significantly also add to that the lag in sending and receiving the NMEA message.
We use the 1PPS pulse at work to synchronise remote devices in the field, once we lock on with the RMC the 1PPS pulse is used to generate an interrupt which ensures that devices are absolutely in sync. On Wed, Apr 25, 2012 at 8:39 AM, StarTraX <[email protected]> wrote: > Further, here are the sentence types I do get: > GPGSA, GPGGA, GPGLL, GPRMC, GPGSV, GPVTG. The SiRF manual indicates the > ZDA message is only provided to the GSW2 software versions 2.3.2 and above > - maybe that's not being implemented on the phones. > > On Wednesday, April 25, 2012 3:43:34 PM UTC+10, StarTraX wrote: >> >> Hi Sy, Thanks for your input. If I understand you correctly, you are >> suggesting I look for a $GPZDA NMEA sentence. I have just checked the SiRF >> NMEA Manual and tried it. I'm getting RMC and GGA but no ZDA sentences on >> either my SGS 11 or HTC , both running 2.3.3. Am I missing something here? >> >> >> On Wednesday, April 25, 2012 3:13:46 PM UTC+10, Sy wrote: >>> >>> You need to enable RMC messages and then wait for a GPS lock, then >>> enable ZDA messages these give a 1PPS message with a timestamp accurate to >>> 1ms. >>> On Apr 25, 2012 6:02 AM, "Andrew Gregory" <[email protected]> >>> wrote: >>> > >>> > 1300ms ahead sounds odd. If it was behind I'd say it was just a >>> reporting delay as part of the usual message processing, but ahead is weird. >>> > >>> > It's not GPS, but if you have an Internet connection, what about >>> querying an NTP server? >>> > >>> > -- >>> > You received this message because you are subscribed to the Google >>> > Groups "Android Developers" group. >>> > To post to this group, send email to android-developers@** >>> googlegroups.com <[email protected]> >>> > To unsubscribe from this group, send email to >>> > android-developers+**[email protected]<android-developers%[email protected]> >>> > For more options, visit this group at >>> > http://groups.google.com/**group/android-developers?hl=en<http://groups.google.com/group/android-developers?hl=en> >>> >> -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- http://about.me/SPlatten -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
