The search coil is boom mounted, using the same boom as the fluxgate magnetometer in the core payload.
The navigation module contains both a 3-axis fluxgate magnetometer & a 3-axis accelerometer.
Imperial College would also be involved in the Kua Fu B fluxgate magnetometers.
The most common types of absolute instrument are the fluxgate theodolite for measuring D and I and the proton precession magnetometer for measuring F.
The fluxgate sensor mounted on the telescope of a non-magnetic theodolite is used to detect when it is perpendicular to the magnetic field vector.