Changes

This is a pair of small Windows utility utilities that analyzes a run and calculates the appropriate recalibration for your Garmin Foot Pod. This software was tested with a Garmin 310XT and 210, but should work with any Garmin that works with the footpod.  The software is available as a GUI and a Command Line Interface. Note, this is open source and released under [http://www.gnu.org/licenses/gpl.html GPL].

The biggest flaw in the approach is that it relies on the GPS signal, and GPS is not that accurate itself. If you do not have a GPS signal, such as a treadmill run, then there is no calibration possible and this utility will show that none is neededno calibration can be automatically performed. That is because the Garmin recorded data is based on the footpod, so it's calibrating the footpod against itself.

A better approach would be to run a known distance, either on a track or using a known course and calibrate against that known value. This utility does not do that yet, but it is a planned upgrade. It will require moving to a nicer The GUI as wellversion allows this type of adjustment.

* Download the command line executable from http://fellrnr.com//Utilities/CalibrateFootPod/ParseTCXGarminFootpodCalibrationCLI.exe* Download the GUI executable from http://fellrnr.com//Utilities/CalibrateFootPod/GarminFootpodCalibration.exe

==Command Line Version=====Garmin Training Center===

===Garmin Ant Agent===

==Consistency=Example Output=The utility looks at how consist the footpod and the GPS are (standard deviation). This is to give you a sense of how useful the scaling factor change would be. This consistency rating is provisional, and is based on the following scale.* stddev < 0.02 = "very good"* stddev < 0.05 = "good"* stddev < 0.075 = "okay"* stddev < 0.1 = "poor"* stddev < 0.2 = "very poor"* stddev >= 0.2 = "appalling"Let me know if you have a better suggestion for the scale. ==Example Output=====All Ant Agent Files====

Version 2.02011-0102-1303-083545063813.TCX calibration factor adjustment 0.9998, Consistency is appalling (stddev 0.2378)Looks like data from cycling not running2011-0102-1404-085610071012.TCX filtered calibration factor adjustment 0.9909, Consistency is very poor 9807 (stddev 0.13220964)2011-0102-1504-090651071012.TCX raw calibration factor adjustment 0.7886, Consistency is appalling 8722 (stddev 0.26362023)2011-0102-1605-072027075131.TCX filtered calibration factor adjustment 0.9816, Consistency is okay 9856 (stddev 0.06710945)2011-0102-1705-083519075131.TCX raw calibration factor adjustment 0.9642, Consistency is poor 9811 (stddev 0.09921393)2011-0102-1806-080330115537.TCX No usable Looks like data was found infrom cycling not running2011-0102-1907-075748065800.TCX filtered calibration factor adjustment 0.8927, Consistency is appalling 9855 (stddev 0.2764067)2011-0102-2007-083432065800.TCX No usable data was found inraw calibration factor adjustment 0.983 (stddev 0.0907)Press return to continePress return to contine

====Single File====

lap average scale 0.99779755lap average scale 0.99549924lap average scale 0.98539866lap average scale 0.98369797lap average scale 0.98929755lap average scale 0.9976lap average scale 0.9974lap average scale 0.9877lap average scale 1.0025lap average scale 0.99lap average scale 0.9705lap average scale 0.983lap average scale 0.9553lap average scale 0.9778lap average scale 0.9967lap average scale 1.002lap average scale 0.9606lap average scale 0.9907lap average scale 0.9837lap average scale 0.9929lap average scale 0.9972lap average scale 0.9843

Filtered Average scale 0.99099855, 9998.08575455%Consistency very poor Standard Deviation scale 0.1322067, 136.22096979% Scale+stddev 1.12310524, 112105.3124% Scale-stddev 0.85879185, 91.85%Raw Average scale 0.983, 98.873044%Average Standard Deviation scale (per lap) 0.99020907, 9.0679% Scale+stddev 1.0737, 107.37% Scale-stddev 0.8924, 9989.023424%

Multiply your current calibration factor by 0.9909983

Press return to continecontinue