A method for indexing a plurality of nodes using a computer system is provided. The reactive ink and the fixer react to form a precipitate which is soluble in at least one of the fixer or the ink. The sash lock mechanism includes an actuator movable to adjust the assembly among a locked position, an unlocked position, and a tiltable position, and a rotor coupled to the actuator. At least one formation parameter is measured azimuthally along the wellbore. The phone may include a modular GPS receiver unit for providing location information to the public emergency response service or a private roadside assistance service.