Table 1.  Average distances in m recorded by each of the GPS devices in sprints of 15 m and 30 m, and the different statistics used to quantify reliability and accuracy.

Test

GPS

χ (m)

SD (m)

TE (m)

CI 95%

Bias (%)

SEM (%)

15 m

mean

13.2

1.4

.2

13.6

12.9

11.9

10.9

1

11.1

1.1

.4

11.8

10.3

26.3

9.6

2

13.1

.6

.2

13.5

12.6

12.8

4.6

3

11.5

.5

.1

11.6

11.4

23.5

4.5

4

12.9

.4

.2

13.2

12.5

14.3

3.4

5

14.6

.7

.3

15.2

14.1

2.4

5.1

6

13.6

.7

.2

14.1

13.2

9.1

4.8

7

14.5

.7

.3

15.0

14.0

3.3

5.1

8

14.9

.9

.3

15.5

14.3

0.8

5.8

9

12.7

.5

.2

13.1

12.4

15.0

3.8

30 m

mean

28.1

1.4

.3

28.4

27.7

6.5

5.1

1

26.1

.6

.3

26.6

25.6

13.1

2.4

2

27.4

1.8

.8

28.8

25.9

8.8

6.7

3

27.2

.8

.1

27.5

27.0

9.2

3.0

4

27.9

.5

.2

28.3

27.5

6.9

1.8

5

28.7

.8

.3

29.3

28.0

4.4

2.9

6

28.6

.7

.3

29.2

28.0

4.7

2.5

7

28.9

.5

.2

29.3

28.6

3.5

1.7

8

30.3

.9

.4

31.1

29.6

-1.1

3.1

9

27.4

.7

.3

28.0

26.9

8.6

2.4

Note: χ (mean), m (meters), SD (standard deviation), TE (typical error), CV (coefficient of variation), 95% confidence interval (CI95%), SEM (standard error of measurement); n = 63 (15 m test), n = 54 (30 m test).