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GPS Accuracy

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Testing to date shows that having a setting of 10 metres as the calculated distance to a control site works effectively as the determination that a runner has visited the correct location.





This image shows a "course" used to validate/refine the 10m proximity setting (distance to controls to register a "hit"). I run the same course – and with control placement I currently have and a 10m proximity setting – I haven’t missed a control hit yet (I run with my GPS watch and one or two Android phones). This shows my “turn-around” point:



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The most inaccurate tracks are the ones from the Garmin 610.

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This image shows the "turn-around" point - ignoring tracks from the Garmin. It shows a circle with a radius of 15 metres.

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This image shows the Android-only tracks . The yellow line is approximately 15 metres long.

Other Sample Events

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A couple of other sample events are discussed here to show the effectiveness of using GPS tracking. This image shows an extract of a file showing multiple GPS tracks:


  • Two Garmin GPS watch tracks are shown: Black and Black Dots.
  • Other tracks are: HTC Black double dots and Green;
  • Motorola: Blue and Blue dotted; Samsung: Black dotted.











These tracks were created as follows:
-       I ran the course carrying 3 Androids running the MyOMaps App (15 metre tolerance) and my Garmin 610
-       I ran the course twice so that gave me 8 tracks
-       See the attached (Note the text in Red lists the devices and the colour of their tracks).

On both runs I succeeded in getting a hit on all control sites with the main device I was monitoring – so I got a valid splits file in each case. However, controls 5, 6 and 8 which are down between high-rise buildings caused some trouble to get a hit. I’d be avoiding this type of control in GPS Orienteering.

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