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.
| 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 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 After introducing the source of interference. The technician remained static on the same position for the duration of the test.