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Table 1 Horizontal accuracy comparison of four GPS instruments from the Forested Park test

From: Development of a wearable global positioning system for place and health research

      

Accuracy Description

Logger

N

Satellitesa

HDOPa

PDOPa

CEPa

H95a

H98a

Distanceb

6

825

10.3

1.19

1.90

2.60

5.00

8.00

3.33

14

819

9.9

1.44

2.34

3.00

6.00

7.20

3.00

15

814

10.4

1.37

2.03

2.60

6.90

9.40

2.49

23

811

10.4

1.17

2.06

2.40

5.60

6.70

2.53

Mean ± SDc

817

10.3 ± 0.23

1.29 ± 0.13

2.08 ± 0.18

2.65 ± 0.25

5.88 ± 0.79

7.83 ± 1.17

2.82 ± 0.40

  1. a HDOP = horizontal dilution of position; PDOP = positional dilution of position; CEP = circular error probable (50%) in metres; H95 and H98 = horizontal accuracy distribution at the 95 and 98 percent levels in metres. All are averaged values.
  2. b Distance in metres between geodetic reference point and average of all recorded GPS data.
  3. c Standard deviation