Show the GPS/UTC Time Offset and read it from the GPS signal.
  • Vote Up0Vote Down MatthiasMatthias
    The Time Offset (actual GPS Time -18s= UTC) come within the GPS signal. Please find the way to read out this from the GPS signal and use it for showing the real UTC and show it in GPS Info for using together with other software like Smart Time sync which also ignoring the offset. At time i have to read first the actual number of Leap seconds and then i have to type it manually in the time sync software. I do not use automatic time scnc because  the network time is sometimes wrong. And i have to set the time manually because i don't use a system with root access. But with Smart time sync works it nice. If GPS Time -18s is at xx:50 then 10 9 8 7 6 5 4 3 2 1 0 and set time..... I know this is also a issue for the time sync software but it will be not bad for mapfactor navigator.
  • 9 Comments sorted by
  • Vote Up0Vote Down hvdwolfhvdwolf
    Why is this so important? Do you have a specific need?
    I don't mean this as criticism. I simply like to know.
    If you explain why you want it, maybe other users also think: That would be a nice feature (or not).
  • Vote Up0Vote Down OldieOldie
    Why do you assume, that GPS time is more accurate than the time coming from an NTP server (I assume NTP time will be the time of your network provider)? Anyway there is no relation to the problem recently coming up from the time problems arising out of weak electricity networks. https://www.heise.de/newsticker/meldung/Zeit-Synchronisation-per-Stromnetz-Energieknappheit-laesst-Uhren-nachgehen-3984126.html And if Android will not allow to set the time automatically without root for SmartTime, it will not allow to do Mapfactor Navigater this job either.
  • Vote Up0Vote Down MatthiasMatthias
    "Why is this so important? Do you have a specific need?" I don't use the mobile internet and have always when i going outdoor no internet. The gps signal is everywhere and send everytime the accurate time to the earth, but the android smartphone use the network time of the gsm provider. But my mobile phone provider have sometimes a wrong network time. (a half minute wrong). The best time coming from the gps satellites, thats true. Sure, the NTP is a good time source, ca GPS time + 0,8s. But the internet is not everywhere like the gps signal.

    Sure this is just a suggestion, no criticism.
  • Vote Up0Vote Down tomastomas
    I am not sure if I understand fully what Matthias wants, but we do not read GPS on Android, we use location API
  • Vote Up0Vote Down hvdwolfhvdwolf
    The location object (from the location api) returns the UTC time (getTime()) in milliseconds (since January 1 1970).
    I assume MNF uses (can use) this as it is part of the "bulk data" (like latitude, longitude, altitude, bearing, etc), retrieved via the location object.
  • Vote Up0Vote Down MatthiasMatthias
    "I am not sure if I understand fully what Matthias wants" - The GPS Clocks run and run and run, and never will be there a Leap second in this time. But The UTC have Leap Seconds. But the GPS Satellites send this Leap second offset (since 01/ 2017 18s) within the signal. It should be possible to find this in the "location api".

    I requested google, but didn't spent time for reading this results:
    https://stackoverflow.com/questions/34810062/location-gettime-returns-utc-with-or-without-leap-seconds
    https://coderanch.com/t/667087/java/Reconciling-Java-date-time-GPS
    https://android.stackexchange.com/questions/113980/leap-seconds-on-android

    In Windows it will be also nice.
  • Vote Up0Vote Down MatthiasMatthias
    The time Stamps in GPS Tracks have also the GPS Time and not the UTC. The Difference is at time 18s.
  • Vote Up0Vote Down OldieOldie
    Just something to time accuracy (German): https://www.heise.de/newsticker/meldung/PTB-Forscher-melden-Fortschritt-auf-dem-Weg-zu-ultragenauen-Atomkern-Uhren-4027014.html
  • Vote Up0Vote Down MatthiasMatthias
    I bought now the Samsung Galaxy XCover 4 (SM-G390F) with Android 7.0. And here works it. GPS Time use here the Offset. I am happy about. This is jst a Android Problem. The GPS in the olderSamsung Galaxy Xcover 3 (SM-G388FDSADBT) (Android 5) works not precise enough. Therefore bought i the new one because the small Galaxy Y made without glonass better gps tracks, i not yet testet how precise the GPS of new Smartphone works, but i guess better because it use also the chinese gps and notebookcheck.com made good test results.

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