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GPS, footpod, and accuracy

footpod

GPS alone vs GPS with footpod

tl;dr: footpod increases the distance measurement accuracy of the gps sportwatch.

Track

Track distance: 1.71km +- 0.01km (3x measurements with garmin vista hcx and polar m 400 = 6 measurements), urban environment.

Hardware

Hardware:

  • Garmin Forerunner 945 (GPS+Glonass, 1s track saving)
    • adidas Mi_coach footpod (ant+ version)
  • Garmin Vista HCx (as a reference)
  • Polar M400 (as a reference)

Results: distance

tl;dr garmin with footpod measured almost the exact distance of the loop (1.71 km).

Three runs with three settings of garmin forerunner: (1) GPS+footpod, (2) GPS only, and (3) footpod only. All runs accompanied with two other gpses as a reference. Track distance: 1.71km +- 0.01km.

Round distance Polar (reference) distance Vista (reference) data source distance time average pace error place
1 1.72 1.70 GPS+footpod 1.71 9:40.5 05:40 -0.10% 1 🥇
2 1.70 1.71 GPS 1.67 9:31.8 05:43 2.24% 3
3 1.72 1.70 footpod 1.68 9:28.7 05:38 1.66% 2
  • garmin with footpod measured almost the exact distance of the loop (1.71 km, -0.10%).
  • garmin with gps only was the worst, with error +2.24%
  • foot pod only (no GPS!) was 1.66% wrong

Results: speed variation during the run

tl;dr: garmin+footpod offers more "stable" and consistent pace/speed

Raw data plots. Garmin device + polar m400 as a reference.

Smoothened data (5s window average). Garmin device + polar m400 as a reference.

Distribution of speeds:

And some statistics:

speed_calc
count mean std min 25% 50% 75% max
hardware source
footpod garmin 569.0 2.958910 0.105325 1.99 2.940002 2.960083 3.000000 3.639984
polar 574.0 2.999651 0.492067 0.00 2.900024 3.000000 3.199951 4.500000
gps garmin 572.0 2.917657 0.770542 0.00 2.580013 2.894989 3.209970 7.880005
polar 576.0 2.957465 0.302476 0.00 2.800049 3.000000 3.099998 4.100006
gps+footpod garmin 580.0 2.940086 0.085252 1.49 2.910004 2.949951 2.980042 3.070007
polar 606.0 2.852475 0.672028 0.00 2.799988 3.000000 3.100002 4.199997

Results:

  • garmin with footpod: very stable pace.
  • garmin with gps only: high variability of speed
  • foot pod only (no GPS!): very stable pace.
  • polar m400: pace is more stable than forerunner in gps-only mode. This may be due to averaging [citation needed].

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gps accuracy while running - shall we use foodpods?

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