A common mistake made with ALL radar equipment is trying to measure the speed of an object at an angle. Due to the nature of how Doppler speed radar works, the radar device will measure most accurate speeds when the object is moving directly towards or away from the radar beam. If you set up the radar’s beam even a slight angle sideways to the path of the moving object, you will measure a SLOWER speed than the object actually travels along its path. At slight angles the error is very small; however at larger angles the error can become substantial. Please refer to the table below for speeds related to off-angle issues.