<para>
This option tells GPSBabel whether to read (on input) or write (on output) 
GPRMC sentences.  The default is to read or write GPRMC sentences.  To 
disable GPRMC sentences, specify <option>gprmc=0</option>.
</para>
<para>
GPRMC sentences contain the "recommended mimimum" positional information, 
including date and time, heading, and velocity.  Note that they do not 
include altitude.  For altitude, you will have to include GPGGA sentences.
</para>

