The Alpha 200i dog tracking and training system lets you monitor up to 20 dogs from up to 9 miles (depending on dog device) on a 3.5� display with a 2.5-second update rate. Easily control training functions by using the button-operated, dog-focused design. You�ll also have access to premium Garmin navigation features, such as preloaded TopoActive maps, BirdsEye Satellite Imagery with direct-to-device downloads and built-in three-axis compass and barometric altimeter. Now, inReach technology adds two-way messaging and interactive SOS alerts for peace of mind while you�re in the field (active satellite subscription required.