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Are Overhauser magnetometers right for you?

GSM-19 Overhauser magnetometers are the choice of the ground magnetic survey industry. They are the lightest and simplest to use of any magnetometer on the market. With in-built navigation there is no need to carry a handheld GPS. Handheld GPS units can reduce the data quality because they are magnetic. They also add additional and […]

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Don’t do a ground magnetic survey without GPS navigation built into the magnetometer.

Most magnetometers can tell you where they have been, but only a few can tell you where to go. For efficiency, ground magnetic surveys are usually conducted along parallel survey lines – or grids. In the bad old days prior to GPS, these grids would have to be laid out at great expense prior to […]

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How to walk straighter and further with less effort when conducting ground geophysical surveys.

Some walk the line straighter than others. Walking straighter lines when conducting ground geophysical surveys increases the production l-km in a day. Alternatively, if there is a fixed amount of work to do in the day, then straighter lines means less walking and less stress on the body. Walking straight in thick vegetation is never […]

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Modern Mag is an official GEM Systems agent.

Did you know Modern Mag sells GEM systems magnetometers and spares? We have been using GEM equipment for over 17 years. We have experience with all of their magnetometers and can help you choose a system for your needs. We chose GEM magnetometers for our field work because they are simply the best magnetometers to […]

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GEM Systems magnetometer navigation firmware now works. Many improvements coming soon!

Modern Mag in conjunction with GEM systems magnetometers is trialing new firmware for the GEM-19 and GSMP-35 series of magnetometers. For many years there has been a fatal flaw in the real time magnetometer navigation function. A programming error caused the lane guidance and distance to end of the line functions to fail, particularly for very long […]

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Base station magnetometers for ground mag surveys.

While any kind of magnetometer can be used as a base station magnetometer to record temporal variations in the geomagnetic field, some are more accurate and convenient than others. It is convenient to use a base station from the same manufacturer since the software that comes free with those magnetometers can diurnally correct that data. […]

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Geophysics heading corrections

Normally the only data correction applied to ground magnetic data is a diurnal (a.k.a base station) correction. This type of correction simply subtracts the static base station reading from the moving rover magnetometer reading of the same time. Cs vapour sensors also require a geophysics heading correction to account for the changes in magnetic field […]

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Walking the line. Ground magnetic surveys in 2013

As a young geophysicist I paid my dues and walked the ground magnetic survey line kilometers. It is a right of passage that teaches graduate geophysicists design, acquisition and processing skills for the most common potential field dataset. Magnetics. Many of you reading this have no doubt done your time, walking the line. Some of […]

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