Compass (if so equipped)
When the ignition switch is turned to the ON position, the compass display B will indicate the direction of the vehicle’s heading.
If the display reads “C”, calibrate the compass by driving the vehicle in 3 complete circles at less than 5 MPH (8 km/h). You can also calibrate the compass by driving your vehicle on your everyday route. The compass will be calibrated once it has tracked 3 complete circles.
To turn on and off the compass manually, push
the 
switch
A while the ignition switch is in
the ON position.
See also:
Replacing spark plugs
Iridium-tipped spark plugs
It is not necessary to replace iridium-tipped (A)
spark plugs as frequently as conventional type
spark plugs because they last much longer. Follow
the maintenance l ...
Three-way catalyst
The three-way catalyst is an emission control
device installed in the exhaust system. Exhaust
gases in the three-way catalyst are burned at
high temperatures to help reduce pollutants.
WARNING: ...
2010 Nissan Altima review
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But then there's the old reliable, the midsize s ...