A connector 11 for a memory card includes a housing 12, a plate 14, a guide plate 16, a lock mechanism 18, and a connector pin keeping part 20. The device contains a carriage that can be manually deployed from its horizontal position on the vehicle’s roof to a near vertical position on either side of the vehicle using rollers guided by a fixed set of roof mounted tracks. A magnitude spectra and spectral filter coefficients are derived. In one linking approach, pairs of tracks are linked together successively by applying a phase shift to the coarser track and then combining it with the finer track such that the transitions of the coarse track estimates become aligned with those of the finer track, whereupon the values can be combined to form a linked position estimate. The token mapper can store the association between the first token and the second token in a token map.