 That just helps keep it down low on top of where you need it. So that way, the higher you are, the more risk you have for drift. Make sure you monitor the wind and the humidity. Wind is obvious. For obvious reasons, you don't want to be out there on a windy day. But on low humidity days, product can travel farther than you really want it to. So make sure you understand what that relative humidity is as well. Sprayer nozzles will also reduce drift.