Abstract: A compass comprising a signal receiver having an antenna unit that can be fixedly mounted on an object on which the compass is to be used, the antenna unit permitting information relating to the direction from which a signal is picked-up by it to be calculated. By communicating with satellites within the GPS satellite network and utilizing the information incorporated in signals transmitted by such satellites, together with the direction information referred to above, a processor permits the calculation of the direction of a heading marker relative to the direction north, thus using the above information for compass applications.