Markers make it very easy to determine where your next pass goes. No guessing, simply look straight ahead at the mark that the marker leaves. These also can be added on a planter at a later date. If your current planter does not have end caps, these will need to be ordered at the time of marker purchase. They also are available with a sequence valve depending on if you have one or two remotes. $1,450, $1,600 with sequence valve.