Honda Accord Sedan Owner's Manual page 263

Compass
3. Turn the selector knob to select
''CALIBRATION.''
260
4. Press the selector knob (ENTER)
to enter your selection. The
display shows you ''PUSH CAL
START.''
While setting the compass,
pressing the RETURN button will
go back to the previous display.
Pressing the MENU button will
cancel the compass setting mode.
2011 Accord Sedan
5. Press the selector knob (ENTER).
The compass display is blinking
and the CAL indicator is shown.
6. Drive the vehicle slowly in two
complete circles.
When the calibration is successfully
completed, the CAL indicator goes
off and the compass display will stop
blinking and show an actual heading.
The audio system is not related to
the compass system. Even if the
compass system is calibrating, the
display returns to the normal display
which you last selected.