9 SCIENTIFIC EQUIPMENT COMPRISING MAGNETOMETERS, MAGNETIC DIPOLE TRANSMITTERS AND SUPERCONDUCTING QUANTUM INTERFERENCE DEVICES; NAUTICAL EQUIPMENT COMPRISING ANCHORED AND BUOYED EARTHING UNITS; SURVEYING EQUIPMENT COMPRISING DOWNHOLE-MEASUREMENT-WHILE-DRILLING SURVEY TOOLS AND FORMATION EVALUATION TOOLS USED FOR DIRECTIONAL CONTROL, FORMATION IDENTIFICATION AND FORMATION EVALUATION; TELEMETRY SYSTEMS COMPRISING DOWNHOLE ELECTROMAGNETIC TRANSMITTERS AND RECEIVERS; COMPUTERS; COMPUTER SOFTWARE USED FOR MANIPULATION AND STORAGE OF DATA, DETECTION AND DECODING OF TELEMETRY SIGNALS; RADIO EQUIPMENT COMPRISING DOWNHOLE TRANSMITTER AND RECEIVER ANTENNAE, SURFACE TRANSMITTERS AND RECEIVER ANTENNAE; ANTENNAE; SCIENTIFIC EQUIPMENT COMPRISING MAGNETOMETERS, MAGNETIC DIPOLE TRANSMITTERS AND SUPERCONDUCTING QUANTUM INTERFERENCE DEVICES, NAUTICAL EQUIPMENT COMPRISING ANCHORED AND BUOYED EARTHING UNITS, SURVEYING EQUIPMENT COMPRISING DOWNHOLE-MEASUREMENT-WHILE-DRILLING SURVEY TOOLS AND FORMATION EVALUATION TOOLS USED FOR DIRECTIONAL CONTROL, FORMATION IDENTIFICATION AND FORMATION EVALUATION, TELEMETRY SYSTEMS COMPRISING DOWNHOLE ELECTROMAGNETIC TRANSMITTERS AND RECEIVERS, COMPUTERS, COMPUTER SOFTWARE USED FOR MANIPULATION AND STORAGE OF DATA, DETECTION AND DECODING OF TELEMETRY SIGNALS, RADIO EQUIPMENT COMPRISING DOWNHOLE TRANSMITTER AND RECEIVER ANTENNAE, SURFACE TRANSMITTER AND RECEIVER ANTENNAE, ANTENNAE, ALL FOR MEASURING AND REPORTING THE STRENGTH OF MAGNETIC FIELDS IN THE FIELD OF OIL WELL DRILLING