This is what you need to inventory Agave cupreata in the dry forests of Guerrero, Mexico. A handy GPS/walkie-talkie (see GPS+Two-Way Radio), a transect rope with knots tied at measured intervals to correct for slope, a Silva Ranger compass with clinometer, a little bit of flagging, and a tally sheet for recording the data (see Field Equipment). [NOTE: The five crews can do a 10% inventory of the entire mescal production area in one day. Used to take them a week. These guys are good].