Starcom Systems Helios User's Manual Manual page 56

Helios Users Guide
NOTE: This function works according to GPS readings. This means, if "GPS Off
When Ignition Off" or "Full low power" options are activated in the unit, the
Tow detection will not work.
Measure RPM from Odometer input – if activated, the device will count the
pulses in the Odometer value to calculate the vehicle's RPM.
The following settings allow you to configure the use of vehicle CAN bus.
Can bus Vehicle / Type / Model / Year – here you can select the vehicle from
the Helios database, which can be accessed from Technical > Helios Can bus.
For more information, see Appendix G – CAN Bus Connection.
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