Alternate radio data frequency selection involves receiving radio data
system signals and extracting region tables from the radio data system
signals, with the region tables each including a quantity of alternate
frequencies and a list of alternate frequencies. The quantity and list of
alternate frequencies included in the region tables are compared with
each other if the quantity of alternate frequencies included in a region
table is equal to or greater than the quantity of frequencies included in
another region table. One of the alternate frequencies included in the
region table is identified if each of the alternate frequencies in the
list of alternate frequencies included in each region table, and the
identified alternate frequency is output if each of the alternate
frequencies in the list of alternate frequencies is included in each
region table. A seek operation is performed if any of the alternate
frequencies in the list of alternate frequencies is not included in each
region table.