Occasionally it is necessary to test the geomagnetic technical equipment to check whether everything is still working properly. It is of course best if an area is available that is known and can be used at any time. We have recently been able to use the lawns at Jade-Weser-Airport. So it is now possible to test the geophysical measuring devices under constant ground conditions. In this special environment it is important to stay always in contact with the tower and to keep an eye on aircraft and helicopters crossing.