Table 4.

Map hybrid positioning systems.

System	Technologies	RSS	IMU		Anchors	Area (${\mathbf{m}}^2$)	Error		Cost	Scalability
			Position	Method			Type	Value (m)
Evennou et al. [51]	WiFi, MEMS	Fingerprinting	Belt	SHS	4	1600	RMSE	1.53	Medium	Limited by calibration
Woodman et al. [52]	WiFi, MEMS	Fingerprinting	Foot	SHS	33	8725	90th	0.73	Medium	Limited by calibration
Wang et al. [53]	WiFi, MEMS	Fingerprinting	N/A	Step	5	1000	RMSE	4.3	Medium	Limited by calibration
Klingbeil et al. [54]	WSN, MEMS	Proximity	Belt	SHS	9	Floor	RMSE	1.2	Low	Yes