Erratum to: GPS Solut (2009) 13:35–41 DOI 10.1007/s10291-008-0095-y

The fourth sentence in section ‘Subframe multiplicities’ (Page 39) should read: 49% (43,006,299 out of 88,099,200 subframes) were observed concurrently with at least two receivers (M ≥ 2).

We thank Tran Hoang Ha for bringing this error to our attention.