The manual is usually my first place to locate info. When I get a consumer product I search the web and locate the manual in an electronic form - often the manufacturer web site provides it.

For cars I purchase the factory service manual. Great bedside reading if you're a gear head.

I love these forums but quite often there is disinformation that gets spread. And admittedly sometimes the manual is vague or (gasp) incorrect. So no one source always has the "right" answer.

In the case of the question about the radio station. The radio manual says:

4.1.4. RBDS functions
RBDS - General:
This car radio is capable of receiving RBDS signals
(RBDS = Radio Broadcasting Data System) on the
VHF bands. RBDS is a technique for the transmission
of inaudible information in the VHF broadcasting
range. This means that the broadcaster sends
information to be analyzed by the auto radio.
All receivable RBDS stations are displayed with their
RBDS station names.
If all criteria for evaluating RBDS information are not
met, the unit will only display the frequency.
The information transmitted by the stations contains
also alternate frequencies. Alternate frequencies
have the same program content as the set
station.
Using these alternate frequencies, the radio can
conduct an evaluation and constantly tune into the
best-quality frequency with the same program content.
PTY (Program Type):
RDS stations can broadcast the station’s program
type (does not apply to all stations)
Examples of program types:
• NEWS - News service
• SOFT - Soft music
• INFORM - Information programs
• NOSTALGIA - Nostalgia
• SPORTS Sports reports
• JAZZ - Jazz music
• TALK - Talk
• CLASSICAL - Classical
• ROCK - Rock music
• R B - R &B
• CLS ROCK - Classic rock
• SOFT RB - Soft R&B
• ADLT HIT - Adult hits
• LANGUAGE - Language program
• SOFT RCK - Soft rock
• REL MUSC - Religious music
• TOP 40 - Top 40
• REL MUSC - Religious talk
• COUNTRY - Country music
• PERSNLTY -Personality
• OLDIES - Oldies
• PUBLIC - Public
• WEATHER - Weather forecast
• PTY 24 - 28 - Not specified
• NO PTY No program type
Programme type ID (PTY)
The program type of the selected station can be
displayed.
For this purpose, press OPT in FM mode, then
press multifunction button PT.
The selected station’s program type is displayed
for 10 seconds (e.g. SOFT RCK = soft rock
music).

Programme type scan search (PTY)
The radio plays stations with a selectable PTY in
order of ascending frequency for 8 seconds each.
To activate the program type scan search, press
OPT in FM mode, then press multifunction
button PT.