The stations list available on VERIPOS units are controlled via UCM (User Control Messages) which are transmitted through the L-Band beams from the VERIPOS Network Control Centre. UCM contain a stations list that is available on each specific beam. For example, the UCM transmitted from 25E has only the stations that are available on 25E.
When switching to a different beam, the stations list will not instantly update until a UCM has been received. As a result, new stations will not appear on the list and the unit will keep receiving data for all common stations between beams until the new UCM is received.