Non-reactive extraction of CAN bus signals

It is proposed a method and a circuit arrangement as well as a navigation system, wherein a coupling out and transmitting on a line bus (1, 2) is carried out signals without the bus cable has to be severed. Further, a sensor (4) is provided which outputs the line signals reproducing sensor signals and wherein the output sensor signals by means of a signal processing (11) and amplified in a defined digital waveform (22) to be reshaped. The filtered signals are then fed to a display device (14) or another device via an additional bus wirelessly or over a line. The invention further relates to a tapping device for wirelessly tap CAN data from a CAN line via the electromagnetic field, without cutting through the CAN lines having to make that a pivotable upper mold part (32) which via a pivot mechanism (41) for the purpose of receiving cAN cables against a lower part (35) can be pressed, and guide grooves (31) for receiving the cAN cable (CAN1, CAN2), wherein in the closed position of the pivoting mechanism conductor circuits to the cAN cable are closed, which can be connected with a signal processing electronics.