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A CAD file of MagArrow can be downloaded here if you want to Design such a mounting structure. Attachment : MagArrow Shell.zip Please note that the external helical antenna is NOT in the CAD file.

With the provided 10-feet suspension cables, the magnetic noise due to most commercial drones can be ignored. However, some MagArrow customers experience stability issue, especially in windy conditions. For a small number of drones, the MagArrow can be attached to the landing gear directly with acceptable noises (line-levelling is still required in data processing). For most drones, however, this configuration causes too much noise. A half rigid mounting Design may solve this problem. It has 2 rigid bars with hinges on one side and 2 flexible cables on the other. On the ground, the rigid side folds to the side. While in the air, gravity will keep the MagArrow further away from the drone. Drone noise can be greatly suppressed since the noise follows 1/R^3. A factor of 2 increase in the separation can lead to a factor of 8 decrease in noise. Please make sure the hinges and the rigid bars are made of non-magnetic material.

Hi MuhammaUnofficially, the MagArrow was Designed to be very non-magnetic, so hard* *But your drone, with its big motors and the magnets in it are much more magnetic But I would suggest flying higher (due to the last drone hitting something) and with a quality mounted camera, looking down at 45 degrees, record raw (for clarity) video footage, and review it. Ideally, following the same survey lines and flight direction. If nothing is visible, try a different height and angle to gain a different View through the foliage. Ideally, with the sun at an angle from behind you to assist in lighting up the View. That's my suggestion based on what you have described. Wishing you the very best "luck"

The 3 Meter accuracy of the GPS in the MagArrow I is 50% Circular Error Probable (50% CEP). That means that if accumulating location data at a fixed point for a long period of time 50 percent of the readings will be within a circle with a 3 meter radius of the actual location, and 50% will be outside that circle. It also requires the GPS antenna have a clear View of the sky with no multipath interference. A good measure of GPS accuracy is to look at the HDOP number. It should be less than 1. Altitude values as a rule of thumb will be half as accurate due to the geometry of satellites. It will be much less accurate if the satellites towards the horizon are blocked, which is often the case. In other words the best accuracy for altitude requires a wide View of the sky. MagArrow II has much improved GPS specs: 50% CEP 1.5m; less than 1m with SBAS.

Many of our customers have found out that widening the attaching points of a MagArrow can greatly improve its stability (reducing swings) during flights. If you are interested in Designing a customized mounting fixture, a CAD file of a MagArrow baseplate can be found here:

In a general sense, the exploration depth of a magnetometer is unlimited. It is certainly sensitive to the Earth's field and this is generated in the Earth's Core, some 5000 km beneath our feet. But for practical purposes, the depth of exploration is determined from survey results by the spatial width of the magnetic field anomaly as observed at the Earth's surface. For discrete objects, the depth of exploration is nominally 1/2 of the width of the magnetic anomaly. This topic is discussed in our Portable Magnetometer Operation Manual. This Manual covers many topics related to survey Design and interpretation including exploration depth. As you will see, survey Design will have a large influence on the depth of investigation.

@ellipsis You are welcome! From the front of the front eyelets to the rear of the rear eyelets, it is a little more than 27 inches. So, your CAD reading is corret.

@rzhang thank you. I’m not sure if I’m reading the CAD file correctly. Is it 27.288 inches between the front and rear eyelets for cable attachments?

@ellipsis We would recommend the rigid part to be ~ 1m. So with the landing gear, the MagArrow is about 1.5m from the drone.

Great idea. What would be a recommended minimum distance below the drone?

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What Affects Geode Trigger Cycle Times? If you're trying to optimize your Geode system for faster trigger cycles—especially in high-repeat environments—there are a few key factors to consider. The goal is to ensure that the system completes its entire cycle (trigger → recording → data transfer → re-arming) before the next expected trigger. Here’s what influences that cycle: 🧠 Core Factors That Affect Cycle Times 1. File Size (Sampling Parameters) Your sample interval and record length directly affect the size of each data file.You can View the resulting file size in the Acquisition Parameters menu.Larger files take longer to transfer, which delays the re-arm process. 2. Data Transfer Rate The Geode typically transfers data at around 450–465 kb/sec.Reducing file size is the best way to reduce transfer time and speed up the cycle. 3. Calibration Frequency By default, the system may attempt to calibrate every N shots, which takes additional time.Go to Options > Calibration and set "calibrate every N shots" to a large number (e.g., 100000) to prevent unnecessary delays. 4. Recording Delay and Record Length If you're operating in a region with a consistently deep seafloor, you can add a recording delay and reduce record length accordingly.Example: If the water column is always >0.3s, you can apply a delay of 0.2s and reduce record length by the same amount.This trims your file size and speeds up the transfer/re-arm process. ⚙️ Best Practices Use the Auto-Trigger function or set trigger sensitivity to the maximum value for testing.Monitor the cycle timing and adjust acquisition parameters to stay within your trigger window.It's often an iterative process to find the ideal configuration for your environment.