Asus R600 - Manual (Page 61)

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You can use the following buttons to go to a different radio frequency:
Lets you search for a traffic channel at a lower frequency. When a station
is located, Destinator checks for TMC data. If there is no TMC data for this
station, Destinator continues to scan until a radio station with TMC data is
located.
Lets you make minimal (0.1) steps toward a lower frequency to bring in the
channel.
Lets you make minimal (0.1) steps toward a higher frequency to bring in the
channel.
Lets you scan for a traffic channel with TMC data at a higher frequency.
TMC Options
You can tap the Options button The Traffic Information Options dialogue box is displayed, as
shown below.