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can someone please point me at some code snippets to detect when the GPS is stationary. I am currently using tinyGPS library and it is working fine, but my data-logger has thousands of stationary details I'd like to not bother logging. Currently I am using this,

uint8_t speedZero() {
uint8_t spd = gps.speed.mph();
  if (spd < 5) {
    return 0;
  } else {
    return spd;
  }
}

But it is too granular at slow speeds, but the NEO-6M drifts a lot and 5mph standing still is not uncommon.

I have tried comparing Last Lat/Lon but not having any success as this Math is waaaay out of my skill-zone.

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    Just add accelerometer sensor to your device. It's just around 1USD and it will easily detect lack of movement. – Filip Franik Feb 26 at 22:07
  • I have tried comparing Last Lat/Lon but not having any success as this Math is waaaay out of my skill-zone. - find a function that gives you a distance between two lat/long points, the remaining math is trivial – Jaromanda X Feb 26 at 22:11
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    I gave an answer in PHP a few month ago, maybe it can help: stackoverflow.com/questions/7222382/… – Peter Feb 26 at 22:44
  • Only log the values when they've significantly changed? – Paul Mar 29 at 20:34
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I found this to get me started.

http://apexlogic.net/code-bank/arduino/serial-gps-find-distance-between-two-points/

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