Compass display
Nissan Altima / Nissan Altima Owners Manual / Instruments and controls / Compass display (if so equipped) / Compass display
Press the 
button when the
ignition switch
is placed in the ON position. The direction will be
displayed.
See also:
New for 2012
There are no significant changes for 2012.
...
Uniform tire quality grading
DOT (Department Of Transportation) Quality
Grades: All passenger car tires must conform to
federal safety requirements in addition to these
grades.
Quality grades can be found where applicable ...
Temperature
High temperatures accelerate the rate of corrosion
to those parts which are not well ventilated. ...