From the Decatur website, I have obtained the specs from the Decatur Genesis II Select. Under the heading "Computer - Speed Ranges" what does the following mean?

Moving Mode Same Direction - Target (Slower or Faster)

From the user's selected minimum speed separation up to 75% of patrol speed"

link to decatur brochure here. reference to "slower or faster" is at the bottom of page 1

http://www.decaturelectronics.com/asset ... -12-11.pdf

If you are driving in the same direction mode, the faster / slower button tells the radar what the target vehicle is doing...going faster or slower that the patrol vehicle. Basically, it changes the mathematical formula to calculate the speed of a motor vehicle...There is more to it, but that is basically it.

The whole 75% thing is that the patrol vehicle has to be going with in 75% of the target vehicle speed in order to get a reading. So, if the target vehicle is going 175Km/H, and the patrol vehicle is going 99Km/H, the radar will not register a target speed. If the patrol vehicle is going 100Km/H a speed on the target vehicle will be obtained...Again, for same direction mode only.

In newer Genesis units, the fast selection isn't even required. The radar automatically detects whether the target is faster or slower.

Has been that way for quite a while now. Just trying to explain it without too much detail.