Audiovox D1708ES User Manual page 14

b).Select 'Angle Mark' using the UP/DOWN buttons, and then press the
RIGHT button to enter the submenu. Choose Angle Mark on or off
using the UP/DOWN button and then press ENTER to confirm the
setting. Press the LEFT button to return.
Angle Mark Screen Display
* On: The screen will show the angle mark icon. (*If an angle
option is available).
Off: The screen will not display the Angle Mark
NOTE: Not all discs contain the features above. The above
features are disc dependent.
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