. 2018 Oct 31;13(10):e0206402. doi: 10.1371/journal.pone.0206402

Table 5. Error calculation data.

Number	Sailing pattern	Navigation equipment	Average error	Range error	Error variance
1	Straight upstream	Magnetic compass	3.45°	6.6	1.97
1	Straight upstream	GPS	4.75°	7.2	1.92
2	Straight downstream	Magnetic compass	2.25°	6.9	1.22
2	Straight downstream	GPS	4.01°	9.4	2.18
3	U-turn in upper reaches	Magnetic compass	2.25°	4.8	1.00
3	U-turn in upper reaches	GPS	4.01°	9.3	6.30
4	U-turn in lower reaches	Magnetic compass	4.48°	6.4	3.46
4	U-turn in lower reaches	GPS	8.59°	10	9.97
5	Sailing with slight direction variation	Magnetic compass	1.14°	3	0.24
5	Sailing with slight direction variation	GPS	4.62°	3.6	0.78
6	Mooring	Magnetic compass	4.98°	3.9	1.14
6	Mooring	GPS	32.19°	190	2513.05