   mt3339    115200.
        .
  GPSFox-V0.89.
   CNTR            , 
      "commandbox",           . 
       "GPSFox commands".
     GPS  ,         "GPSFox Quick Guide-V1.3", 
     .     ,     
   .
     .           . 

  $PMTK251,0*28 (115200)
4800       $PMTK251,4800*14
9600       $PMTK251,9600*17
19200      $PMTK251,19200*22
38400      $PMTK251,38400*27
57600      $PMTK251,57600*2C
115200     $PMTK251,115200*1F
 4800 - 38400   1Hz
 57600 - 115200  1Hz-10Hz

Every 100ms (10Hz)   $PMTK220,100*2F
Every 200ms (5Hz)    $PMTK220,200*2C
Every 500ms (2Hz)    $PMTK220,500*2B
Every 1000ms (1Hz)   $PMTK220,1000*1F
Every 2000ms (0.5Hz) $PMTK220,2000*1C

If the command is correct and executed, GPS module will 
output message $PMTK001,220,3*30

NMEA sentence Software command 
Factory default $PMTK314,-1*04
Only GLL at 1Hz $PMTK314,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29
Only RMC at 1Hz  $PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29
Only VTG at 1Hz $PMTK314,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29
Only GGA at 1Hz $PMTK314,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29
Only GSA at 1Hz $PMTK314,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29
Only GSV at 1Hz $PMTK314,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0*29
Only ZDA at 1Hz $PMTK314,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0*29
RMC, GGA, GSA 
at 1Hz and GSV at 
0.2Hz 
$PMTK314,0,1,0,1,1,5,0,0,0,0,0,0,0,0,0,0,0,0,0*2C<CR><LF>
If the command is correct and executed, GPS module  will output message 
$PMTK001,314,3*36<CR><LF> 
LOCOSYS Technology Inc.
