Transient Technologies LLC Company designed VO-36 measurement wheel (odometer), that is compatible with VIY2 and VIY2' series GPR produced before. Yje VO-36 secures safely to upper cover of  and connects to communication cable instead of marker button. There are three GPR operation modes: continuous, wheel triggered and step-by-step. In continuous mode the VO-36 can utilized as distance marker.