ONTRAK

"A modular measurement-while-drilling bottom hole assembly, consisting primarily of a bi-directional communication and power module and an electronic sensor module generally having a central processor, data memory and a plurality of sensors for making directional, drilling and formation measurements, namely, direction, temperature, bore and annular pressure, formation density, porosity, resistivity, vibration, stick/slip, gamma ray and other drilling system or formation evaluation measurements, that is used for directional drilling and formation evaluation in subterranean oil, gas, water, mineral and geothermal cell formations."