Geometrics is proud to introduce the latest generation of land magnetometers to the geophysical market! The G-864 marries the highest quality magnetometer available today with a modern user interface, making surveying easier and more efficient for years to come. The G-864 cesium magnetometer utilizes a modified Android tablet, the Getac ZX70, as the data console. This offers users the ability to store large amounts of data as either a single or multiple projects. The Android tablet incorporates a navigational display and the ability to preload survey lines, a feature that will steer users throughout the survey area. Preloading the survey lines, instead of using traditional tape measures and stakes to create the lines in the field, reduces setup time and crew size. The G-864 lets users visualize their collected data as a color map. This allows for instant data QC and for creating new survey lines for in-fill where additional data may be needed. Finally, logging data using a wireless platform eliminates the potential for snagging or breaking instrument cables during the survey. Modern surveys require large arrays of magnetometers to cover a site as fast as possible. The G-864 can handle up to 4 magnetometers at a time, offering the ability to survey a wider area at once. With a maximum sample rate of 10 Hz, a noise floor at <0.004 nT sqrtHz rms the new G-864 allows for faster, more accurate surveys. Time is money, and the G-864 will help you save both.

Features and benefits

  • Android Acquisition Software: Modern user interface allows for WiFi communication and unlimited expansion of features.
  • GPS Navigation: No more staking! Define survey geometry beforehand to limit field time.
  • In-Field Data Review - Plot GPS positions, analyze profiles, and create a color contour map before leaving the field.
  • Supports 4 Sensors: Cover more area, faster by logging from 4 magnetometers at once and defining the sensor separation.
  • Data Saved to Tablet and Backpack: Avoid data loss with data redundancy.

Technical Details

G-864 Magnetometer Specification List
  • Operating Principle: Self-oscillating split-beam Cesium Vapor (non-radioactive).
  • Operating Range: 20,000 to 100,000 nT.
  • Operating Zones: The earth’s field vector should be at an angle greater than 10° from the sensor’s equator and greater than 10° from the sensor’s long axis. Automatic hemisphere switching.
  • Noise: < 0.004 nT Hzrms. (SX (export) version: 0.02 nT/ Hzrms).
  • Max Sample Rate: 25 Hz.
  • Heading Error: ±0.75 Hz.
  • Gradient Tolerance: 20,000 nT/m.
  • Temperature Drift: 0.05nT/°C.
  • Power: 24 to 35 VDC, 15 - 30 W to start and 20 to 35 VDC, 15 W to run.
  • Data Logger: Getac ZX70 Android tablet, or user provided Android device.
  • Data Storage: 1 GB USB drive, 16GB on tablet.
  • Data Format: ASCII, MS Windows PC compatible micro-seismic or earthquake studies.

Mechanical/Environmental Specifications

  • Backpack: 4.3 kg (9.5 lb).
  • Storage Temperature: -45º C to +70º C (-48º F to +158ºF ).
  • Operating Temperature: -35º C to +50º C (-30º F to +122º F).
  • Cable Length: User selectable cable lengths of 3, 9 or 13 ft. (0.9, 2.7, 4 m).
  • Electronics Module Dimensions: DIA: 7 cm; L: 38.7 cm.
  • Weight: 0.91 kg (15.25 x 2.75 in; 2 lb).
  • Sensor Dimensions: DIA: 7 cm; L: 17.2 cm; Weight: .82 kg with cable. (6.75 in x 2.75; 1.8 lb).
  • Altitude: Up to 9,000 m (30,000 ft).
  • Weatherproof: O-Ring sealed for operation in the rain and/or 100% humidity, Tablet: IP67 rated.
  • Shock: Survives a 3 ft drop onto a hard surface.
  • Warranty: 2 year on sensor, 3 year on Getac ZX70 tablet.
  • Power: 24 to 35 VDC, 15 - 30 W to start and 20 to 35 VDC, 15 W to run.
  • Battery: Lead acid or Li-Po options available.
  • Standard Accessories: Shipping/storage case, Power Data Cable, DC/ Data Junction Box, MagMap, MagPick, and CsAz software.
Current Software and Firmware
  • The current version of the G-864 Embedded Software is Setup-G864-Embedded-3.2.2068 released April 2024.
  • The current version of MagNav is MagNav-release-3.0.4188 released in April 2024.
To download these files, click here G-864 Setup Files or click on the Firmware/Software button below.
G-864 Magnetometer Shipping Weights & DIMS

Shipping Weights & DIMS

Contents Dimensions (L x W x H) Weight
Case 1 - Backpack, Dogcatcher data logger, Tablet, Batteries, Cables, DGPS 32in x 20in x 13in 81cm x 52cm x 33cm 60lbs 27kg


  • Environmental: Find abandoned wells, pipes, and storage tanks quickly.
  • Archaeology: Perform basic magnetic archeology surveys.
  • Geology: Survey for regional variations in the magnetic field for mining and oil and gas applications.
  • UXO Detection: Collect data at high speed with a fast sample rate, making detection and delineation of UXO quick and easy.