RT_Trig_Forward_Dist: Triggered Test Forward and Deviation Distance
RT_Trig_Forward_Dist: 141, 4 (0x8D0420 + unit ID) (0x344)
Bytes 0-3: Forward Distance
Bytes 4-7: Deviation Distance
Distance resolution is m/1000
Forward Distance is the current displacement in the direction of the initial heading from the start location of the triggered test.
Deviation Distance is the current displacement at right angles to the initial heading from the start location of the triggered test.