RDS Callsign Identifier (for USA)
This identifier does not work for non-U.S. stations!
Some Canadian stations now work. In some cases, Canadian stations are
using the same codes as assigned to U.S. stations.
Often, the "C" is
replaced by a "W". (so if you see a PI code that resolves to "WING" on
107.9 while the real WING is
on 102.9, you're probably actually tuned to
CING.