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Parameter Description
Power 0.5 Watts needed for full operation. If the batteries run down, the sampling rate can decrease so less power is used.


Around 1 nT (compared to the earth’s field at the poles which is around 60 000 nT).


Less than 200 kg. Equipment needed for servicing less than 10 kg.

Sampling Frequency

Samples taken once a second for 150 milliseconds at maximum power. This decreases to once a minute if power is low over the winter. Time and position is measured using an attached GPS system.

Servicing Frequency

Normally once a year.

Longest time unattended

444 days

Coldest Temperature


Highest Altitude

10 550 ft