Table 1.

Difference between the LPS and reference system for position, for optimal and sub-optimal condition respectively.

	Optimal			Sub-optimal
	n	Average (m)	Maximum (m)	n	Average (m)	Maximum (m)
Task 1	2468	0.27 ± 0.22	1.40	1449	1.46 ± 1.95	13.07
Task 2	4675	0.17 ± 0.11	0.81	2822	1.72 ± 1.42	8.24
Task 3	1190	0.34 ± 0.24	1.41	565	1.37 ± 1.72	9.60
Task 4	2379	0.26 ± 0.17	1.91	2118	1.41 ± 1.52	9.85
Task 5	19454	0.19 ± 0.10	0.96	15845	1.89 ± 9.10	194.64