• If the GPS is starting from fresh, it needs to download the almanac and ephemeris data. This takes a minimum 12.5 minutes, assuming no errors. If there are errors, then depending on what data is missing it could be another 12.5 minutes before that data is re-sent. It's quite likely the first fix will take two goes, or 25 minutes. It's down to a bit of luck, really.

  • If the GPS is starting from fresh, it needs to download the almanac and ephemeris data. This takes a minimum 12.5 minutes, assuming no errors

    AT6558 has 56 channels.
    TTFF is possible with 45s +
    (=cold start without time and data)

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