get_trace
Description:
Gets the last cached value of the specific trace_type given.
Parameters:
| this | |
| trace_type | 
           specific NMEA trace type to gather.  | 
      
Returns:
| 
           the NMEA trace, or   | 
      
Gets the last cached value of the specific trace_type given.
| this | |
| trace_type | 
           specific NMEA trace type to gather.  | 
      
| 
           the NMEA trace, or   |