gps-details

Garmin Activity Testing

Author: Michael George

Created: 9 July 2024

Overview

This page documents activity testing that was performed on 2024-07-03, whilst walking in an open-sky environment.

One continuous activity was recorded using the Windsurfing Application by ViVSurfer.

• Forerunner 255
  • Windsurfing

1 Hz and 5 Hz data was also collected using Motion Minis.

The devices were carried as shown in this photograph, including a COROS APEX 2 Pro on the left:

Data

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

• 2024-07-03-walking-fr-255.zip - Forerunner 255

The OAO data from the Motions is available for download in ZIP format:

• 2024-07-03-walking-motion.zip - Motions @ 1 Hz and 5 Hz

Observations

Windsurfing

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).

A comparison of 5 Hz Motion data (red), 1 Hz Motion data (blue) and 1 Hz Garmin data (green) shows the 1 Hz sampling artefacts (re: Nyquist theorem).

Comparison

Comparison of the speeds for Windsurfing (red) vs 5 Hz Motion (blue):

Comparison of the speeds for Windsurfing (red) vs 1 Hz Motion (blue):

Notes:

• The behavior of the filtering throughout the entire session remains fairly constant.
  • The data from the Garmin is very similar to that of the 1 Hz Motion, just exhibiting more noise.
• It is interesting to contrast this data with that of the COROS APEX 2 Pro, since it uses the same Airoha AG3335M chipset.
  • The APEX 2 Pro results for these test sessions can be found on a separate page.

Summary

Windsurfing

• 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 / cycling in previous tests.