1. A method for locating a mobile unit (M) using wireless signal data obtained from transmissions between the mobile unit M and one or more of a plurality of terrestrial wireless communication stations, comprising: receiving, for an instance of locating the mobile unit M, M location data obtained using information from two way wireless transmissions between the mobile unit M at an unknown terrestrial location, and one or more of the communication stations; first obtaining a first location estimate for M from a first location technique, wherein the first location technique determines said first location estimate using one or more values (V) obtained using the M location data, wherein each value V is indicative of a difference in arrival times of the wireless transmissions between: (i) the mobile unit M and one of the one or more communication stations, and (ii) the mobile unit M and a different one of the one or more communication stations; wherein the step of first obtaining determines the first location estimate relative to known terrestrial locations where each the one communication station and the different communication station reside when a corresponding one of the wireless transmissions is communicated with the mobile unit M; second obtaining a second location estimate for M using a second location technique, wherein the second location technique determines said second location estimate using one or more occurrences of directional data obtained using the M location data, wherein each occurrence of the directional data is indicative of an angular orientation about one of the communication stations (CS) of a direction of the wireless transmissions to CS from the mobile unit M; determining a resulting location estimate of the mobile unit M, wherein at least one of the following substeps (i) and (ii) is performed: (i) determining one or more values for indicating which of said first and second location estimates is preferred, and (ii) combining said first and second location estimates for determining said resulting location estimate; wherein the resulting location estimate identifies a likely location of the mobile unit M relative to one or more fixed positions on the earth; outputting said resulting location estimate of the mobile unit M.