A system may dispense a marker, determine location data or time data, and substantially simultaneously trigger the dispensing of the marker and logging of the location data that identifies a geographic location at which the marker is dispensed or the time data that identifies a time at which the marker...http://www.google.com/patents/US7640105?utm_source=gb-gplus-sharePatent US7640105 - Marking system and method with location and/or time tracking
