The comparison of Holux and Qstarz GPS receivers in free living conditions

Michal Vorlicek, Tom Stewart, Jan Dygryn, Lukas Rubin, Josef Mitas, Jasper Schipperijn

The comparison of Holux and Qstarz GPS receivers in free living conditions

Číslo: 3/2019
Periodikum: Acta Gymnica
DOI: 10.5507/ag.2019.009

Klíčová slova: Global Positioning System, travel mode, validation study, dynamic accuracy, Holux RCV-3000

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Anotace: Background: Physical activity (PA) is one of the major factors influencing human health. An important group of determinants are elements forming the built environment. For a proper understanding of relationships between the built environment and PA, we need to measure PA in space.

Objective: This study aims to verify the accuracy of the Holux RCV-3000 GPS logger, which has not yet been validated in relation with PA.

Methods: Two GPS receivers (Holux RCV-3000 and already validated Qstarz BT-Q1000XT) were tested during walking, running and cycling. A total of 1,908 GPS points were recorded by each device. For each trip, we calculated the percentage of points that fell within 1, 2.5, 5, and 10 m buffers, as well as the mean and median error.

Results: Our results showed that 53.1% of all Holux and 45.1% of Qstarz GPS points fell within 2.5 m of the expected location, 90% (Holux) and 80% (Qstarz) fell within 10 m and the median error was 2.33 m and 3.15 m, respectively.

Conclusions: The dynamic spatial accuracy of the tested Holux RCV-3000 was better than more expensive Qstarz device and can be considered as a valid instrument for assessing the spatial location of PA in future work.