gps-details

Garmin Activity Testing

Author: Michael George

Created: 9 July 2024

Overview

This page documents activity testing that was performed on 2024-05-27.

• Forerunner 255
  • Running
  • Hiking
  • Stand Up Paddling
  • Cycling
  • Other

The testing was relatively unstructured but has been documented for completeness.

Data

All of the FIT data is available for download in ZIP format:

• 2024-05-27-walking-garmin.zip - Forerunner 255

Observations

Running

The image below shows how speed (red) is heavily filtered / smoothed. Positional data (green) is relatively noisy, and possibly closer to the raw GNSS data (unlike COROS).

Hiking

The image below shows how speed (red) is heavily filtered / smoothed. Positional data (green) is relatively noisy, and possibly closer to the raw GNSS data (unlike COROS).

Stand Up Paddling

The image below shows how speed (red) is heavily filtered / smoothed, but not as much as running or hiking. Positional data (green) exhibits the type of aliasing that is often observed in unfiltered speeds from 1 Hz devices (re: Nyquist).

Cycling

The image below shows how speed (red) does not appear to be filtered / smoothed, and exhibits the type of aliasing that is often observed in unfiltered speeds from 1 Hz devices (re: Nyquist). Positional data (green) is not dissimilar to running and hiking.

Other

The image below shows how speed (red) does not appear to be filtered / smoothed, and exhibits the type of aliasing that is often observed in unfiltered speeds from 1 Hz devices (re: Nyquist). Positional data (green) is not dissimilar to running, hiking, or cycling.

Summary

Running / Hiking

• Speed is heavily filtered / smoothed.
• Positional data is relatively noisy, and possibly closer to the raw GNSS data (unlike COROS).

Stand Up Paddling

• Speed is heavily filtered / smoothed, but not as much as running or hiking.
• Positional data exhibits the type of aliasing that is often observed in unfiltered speeds from 1 Hz devices (re: Nyquist).

Cycling / Other

• Speed does not appear to be filtered / smoothed, and exhibits the type of aliasing that is often observed in unfiltered speeds from 1 Hz devices (re: Nyquist).
• Positional data is not dissimilar to running, hiking, or cycling.