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| Location type | Turning angles in group (%) | Direction of error (degrees) | ||
| Mean (sd) | z-value | p-value | ||
| All | 100 | 129 (77) | 0.89 | >0.2 |
| PDOP<6 | 94 | 42 (80) | 0.02 | >0.5 |
| PDOP<3 | 25 | 140 (79) | 0.29 | >0.5 |
| 3-D | 27 | 8 (79) | 0.61 | >0.5 |
