Patent ID: 8717235

Claim:
A device comprising: a positioning receiver for performing positioning on the basis of two or more different satellite-positioning signals transmitted by a same reference station of at least one satellite navigation system, the different satellite-positioning signals being specifiable by different signal identities; a receiver for receiving assistance data relating to said at least one navigation system; and an examining element adapted to examine the received assistance data; wherein said examining element is adapted to examine the assistance data to find out whether the assistance data includes information on usability of at least one of said two or more different satellite-positioning signals, wherein if the assistance data comprises information relating to the usability of at least one satellite-positioning signal, said examining element is further adapted to examine said information to find out an indication of the reference station to which said at least one satellite-positioning signal relates and the signal identity of said at least one satellite-positioning signal, wherein the device is adapted not to use in the positioning such satellite-positioning signal which is indicated not to be usable.