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Why is the elevation information not correct?

Summing up

RouteConverter sums up all ascends and descends and displays them prominently above the position list as "Overall ascend" and "Overall descend". This is sometimes a source of confusion, because these numbers vary greatly due to

  • inaccurate data and
  • no smoothing algorithm that is applied to them.

Thus they are largely determined by the number of positions, i.e. the more positions there are, the higher the "Overall" values become. This can be easily checked by significantly reducing the number of positions.