Ive had my mk3 for about 6 weeks now, very confussing to begin with, but keep at it, and it becomes clear,
you have 2 modes, and 1 switch, to switch between them, firstly in search mode, this gives you a 16ft area of search, either above or below ground, hold the mk3 in ya palm with the thick end facing you, you scan the area, if your near to the collar you'll get some beeps, and the LED's flash at 16ft, as soon as you get this signal, you can search more, if you get nearer, the "beeps" get quicker and the LED screen will go from 16 to 14 to 12 etc, therefore its quite easy to tell if your