Geometrics MagArrow Mk2 magnetometer
Self-contained cesium total-field magnetometer with onboard GPS, storage and Wi-Fi — no data connection to the UAV needed.
The MagArrow II is the second generation of Geometrics' best-selling magnetometer — a fully self-contained sensor with built-in GPS receiver, data recorder and battery, usable with any UAV able to carry 1 kg. To minimize motor and electronics noise, SPH Engineering recommends 3 m suspension ropes on larger platforms such as the Inspired Flight IF1200A, or extension poles on smaller drones like the DJI M350/M300 RTK.
An alternative is to mount the MagArrow directly on the drone's legs and remove motor noise with a low-pass filter during post-processing — a good approach for UXO search, though suspension ropes are preferable for archaeology or geology work that needs to register weak or long anomalies.
Technical
| Sensor designation | MFAM |
| Number of sensors | 2 (for redundancy and to avoid dead zone) |
| Sensor technology | Laser-pumped cesium total field |
| Sensor sensitivity | Very high |
| Sampling rate | 1,000 Hz |
| Dynamic range | 20,000 to 100,000 nT |
| Live data stream to ground station | No |
| Design | Aerodynamically shaped body with 4x suspension ropes |
| Battery | User-supplied 1800/2200 mAh 11.1 V Li-Po battery (not included) |
Environmental
| Operating Temperature | -20°C to +40°C |
| Ingress Protection | IP52 |
| Humidity | Non-condensing |
Supported Drones
| Compatible platforms | DJI M400, DJI M350 RTK, DJI M300 RTK, Inspired Flight IF800, Inspired Flight IF1200A, or similar |
Mechanical
| Weight | 1.2 kg (w/o battery) |
| Size | 1 m long sensor body |
What's in the kit
- MagArrow magnetometer
- AC power adapter
- USB drive containing operation manual and software
- JIS1 screwdriver and drill bit
- Suspension cords
- Transport hard case