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Default Speed: If the GPX file has no speed set, this speed is used.

Force Speed: Even though the GPX file has speed set, use the default speed.

Inject Course Points: Besides the start and end point, insert up to 48 course points in between, but with a minimal distance of 1000m.

Use Walking Grade Factor: Slow down or speed up the default speed, depending on the grade of the track.

/**
  * Grade adjusted pace based on a study by Alberto E. Minetti on the energy cost of
  * walking and running at extreme slopes.
  *
  * see Minetti, A. E. et al. (2002). Energy cost of walking and running at extreme uphill and downhill slopes.
  *      Journal of Applied Physiology 93, 1039-1046, http://jap.physiology.org/content/93/3/1039.full
  */
 public double getWalkingGradeFactor(double g)
 {
     return 1.0 + (g * (19.5 + g * (46.3 + g * (-43.3 + g * (-30.4 + g * 155.4))))) / 3.6;
 }

Reduce Points to: Reduce the total amount of points in the track. Some devices have an upper limit also depending on the courses already on the device.