I do not use it myself. It was only before I got the GPS marker system for my truck mount boom. Otherwise, I never want to call attention to the fact that I was at a lawn. Too many paranoid people and lawyer chasers here. I was telling fl-landscapes about the time I mixed up a couple of gallons of blue dye and surfactant when I was demoing my boom and backpack set up in front of some people in the business. No blue dye on me or on anyone else. That is why I harp on leak proof fittings on the hoses and air inducted fan nozzles for lawn applications. If I look like a smurf, that means more spray is going on me than the lawn.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738