Resulting from over 20 years of research and development activity and based on electromagnetic (EM) data communications technology, the CaTS™ system transmits low frequency EM signals from downhole to surface, or surface to downhole, using the well’s tubing or casing as the transmission medium. The system can be retrofitted into existing wells using either wireline or coil tubing, or alternatively, may be completion deployed. CaTS transmits high-quality pressure and temperature information and has gained broad industry acceptance as a cost-effective, high value solution to many of the long-standing problems of acquiring downhole data.