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Table 4 Effect of different sources of interference (Test IV) on the spatial accuracy (measured as the root mean squared error, RMS) of the Igot-U GT100 GPS data-loggers.

From: Usefulness of commercially available GPS data-loggers for tracking human movement and exposure to dengue virus

Source of interference

Number of locations

RMS before1

RMS after2

ΔRMS

Neck strap

784

6.2

6.2

0.0

Wool Purse

825

5.1

8.7

3.6

Cell phone case

822

4.4

8.4

4.0

Back Pocket

831

2.6

9.5

6.9

  1. 1 Before applying the source of interference (i.e., the GPS was held in the hand of a field technician in an open area with clear view of the sky).
  2. 2 After introducing the source of interference. The technician remained static on the same position for the duration of the test.
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International Journal of Health Geographics

ISSN: 1476-072X