Grundig 30GB - Manual (Page 84)

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Autoscan Searching Mode
If you press the jog button in ◀◀ or ▶▶ direction long, the frequency
automatically increases or decreases to search available frequency
channels (Ex: 89.1MHz
91.9MHz).
Frequency searching stops when you press the jog button shortly during
Autoscan searching.
Manual Searching Mode
You can directly search audible channels by shortly pressing the jog
button in ◀◀ or ▶▶ direction (Ex:91.8MHz
91.9MHz).