As with any 2-way radio system, Marco Polo has limited range. In excellent conditions the range can be up to 2-miles but in suburban neighborhoods, rough terrain or forests, the range can be considerably less. If the tag is out of range of the locator when you begin searching, you can walk or drive around the area to expand the search. Marco Polo then acts like a personal radar, searching every inch of the surrounding area as you move, including the insides of buildings and backyards.