I'm guessing you're talking about the TP AF TA symbols in the top right? It's not in the FAQ yet, but is listed in the release notes for b11 (not 13)

Implemented tuner mode indicators:

"TP" means the currently tuned station carries travel announcements
"TA" normal means that player will switch to radio from normal/aux if a travel announcement is made on either the currently tuned station (see "TP" indicator) or via another station.
"TA" dimmed means TA mode is on but the currently tuned station doesn't carry travel announcement or transmits information about those that do.
"TA" missing means TA mode is off.
"AF" normal means that the player has other frequencies available for the currently tuned station.
"AF" dimmed if AF mode on but alternate freqs not available.
"AF" missing means AF mode is off.

Is that what you wanted to know?