Fig 1.
Locations recorded by the Garmin control device (small dark dot) and two CatLog data loggers (large green and blue dots) with a fix interval set to 1 min along the path centered on Briquenay. Red points represent starting and ending points.
Table 1.
Variables used in the evaluation of GPS performance and accuracy during stationary and controlled motion tests.
Fig 2.
Location errors from 39 GPS CatLog data loggers relative to the National Geodetic Survey coordinates obtained of (a) 700–2300 fixes per unit under antenna positions (up or down) and fix intervals (program A, program B or program C) in an open habitat and (b) 250–2300 fixes per unit under different habitats with fixed conditions. Ellipses represent 95% confidence areas and centroids represent the average location error.
Table 2.
Results from stationary unit tests performed with 40 low-cost CatLog GPS data loggers: the fix success rate (FSR) ± standard deviation (SD), mean time of the fix acquisition (μFAT), root mean square of the location errors (LERMS), mean location error (μLE), median location error (mLE), percentage of fixes with LE < 10 m, the mean number of outliers per unit (N outliers) and root mean square of the location errors after the removal of outliers (LERMS without outliers) for positional fixes collected from for two antenna positions, three fix intervals programs and four habitat types.
Table 3.
Results per trip from motion controlled tests performed on two low-cost CatLog GPS data loggers mounted on two dogs: the number of fixes acquired (N), distance walked (m), walking time (min), fix-success rate (FSR), percentage of fixes with LE < 10 m, root mean square of location errors (LERMS), mean location error (μLE) ± standard deviation (SD), median location error (mLE), number of outliers per trip (N outliers) and root mean square of the location errors after the removal of outliers (LERMS without outliers).
Table 4.
Results per habitat from motion controlled tests performed on two low-cost CatLog GPS data loggers mounted on two dogs: the number of fixes (N), mean location error (μLE) ± standard deviation (SD), median location error (mLE), range of location errors, percentage of fixes with LE < 10 m and root mean square of location errors (LERMS).
Table 5.
Summary of GPS FSR and LE values reported for stationary and motion controlled tests during this study and for built-in wildlife GPS collars under various test conditions.
The reported values are the range of mean values reported across the studies indicated.