Lantronix X300 Series X300 Series User Guide Rev B - Page 96

10: Services Parameters Description Checksum *33 End of message termination (1) Satellite used in solution. (2) Maximum DOP value reported is 50. When 50 is reported, the actual DOP may be much larger. GPVTG Format The $GPVTG message includes course over ground and ground speed. Example: $GPVTG,0.0,T,0.3,M,0.0,N,0.0,K,A*20 Parameters MID VTG Parameters MID Course Reference Course Reference Speed Units Speed Units Mode Checksum Table 10-11 VTG Data Format Description VTG Protocol Header Example - $GPVTG Measured heading Example - 0.0 degrees True Example - T Measured heading Example - 0.3 degrees Magnetic(1) Example - M Measured horizontal speed Example - 0.0 knots Knots Example - N Measured horizontal speed Example - 0.0 km/hr Kilometers per hour Example - K Indicates  A - Autonomous  D - DGPS  E - DR  N - Output Data Not Valid  R - Course Position(2) (3) (4)  S - Simulator Example - A *20 X300 Series IoT Cellular Gateway User Guide 96