The aim of this work is to measure the absolute Earth’s magnetic field components in a mobile operation with high precision. Due to their periodic voltage-flux characteristics, SQUIDs are not able to absolute measure magnetic flux greater than one flux quantum. Besides this, the effective area of SQUID magnetometers is in the range of several square millimetres to ensure high resolution magnetic field measurements. An effective area of this size corresponds to a periodicity in the nanotesla range, which makes them unsuitable for most mobile operations. Here, we present a new configuration of multiple SQUID sensors for each spatial direction realized on a single silicon chip. The SQUIDs are produced with sub-micron cross-type Josephson junctions that withstand high background fields of up to 6.5 mT during cool-down and operation. The combination of the SQUIDs is able to operate as an absolute field magnetometer in the earth’s magnetic field. A special processing procedure will be introduced which iteratively calculates the absolute value of the magnetic field vector components with a noise of about 6 fT/Hz1/2 in the current setup. The absolute accuracy of the setup was measured and is dominated by fluctuations of the sensor angles and drifts of the room temperature electronics.