Telemetry GPS Module 2.0 TQIDetails: Standard telemetry sensors use your vehicle's gear ratio and tire size to calculate speed based on RPM. This system works well for hard surfaces, but wheelspin on loose surfaces causes inaccurate speed readings. The Telemetry Expander 2. 0 with the installed GPS Module 2. 0 provides the most accurate speed data possible. The Traxxas GPS Module 2. 0 uses both GPS and GLONASS global positioning to deliver precise, real time speed information