Voting is a system that is generally used where the user is on the move and the radio like a mobile phone will lock onto the strongest signal form transmitting and receiving. Generally used on a rail network or alike. Repeaters are placed along the path and as the user moves location the radio will automatically scan for the strongest signal to operate on. Systems either in UHF or VHF. BHP uses this System between Karratha and Yandi area C. H.I. uses their in UHF also in the Pilbara region.