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* The phone needs a good view of the sky, so holding it in your hand, or strapping it to your upper arm works well. Clipping it to a waistband can reduce GPS accuracy.
* Close all other applications other than the running application. This does not appear to be a major problem, but it may help slightly.
* Even if your smartphone and your application are accurate, check that the exported data is also accurate, as I've seen some problems in this area.