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Marine seismic towing cable is a geological research technology based on the principles of marine seismic exploration. Marine seismic exploration is the process of manually emitting sound waves into the seabed to induce seabed vibrations. The seismic wave signals reflected from the seabed are then received by hydrophones on a towed cable and converted into digital signals, which are then transmitted to the onboard system for processing. Due to the correlation between seismic response caused by different geological structures and their acoustic impedance, information on underwater geology, geomorphology, and oil and gas distribution can be obtained through acoustic impedance inversion. In the process of ocean exploration with the help of towing cables, electronic compasses are important devices for measuring and controlling their attitude, and the accuracy of attitude information will directly affect the results of exploration.

At present, seismic cables used for exploration are generally 3000 to 8000 meters long, consisting of dozens of composite sections connected by sealed and waterproof stainless steel joints. The towing cable is filled with silicone oil, and the beginning and end of the section are non working sections without a hearing device, used to assist in controlling the underwater posture of the towing cable. The stability and effectiveness of exploration signal acquisition require certain control over the depth and spacing of the towing cable, which is not an easy task for such a long underwater towing cable. The key to solving the problem lies in accurate measurement and prediction of the towing cable attitude. The electronic compass is the key to obtaining real-time underwater attitude data of the towed cable and achieving azimuth reference angle measurement.

The electronic compass product HEC366 developed by Huilian Technology is a high-performance, low-cost 3D electronic compass suitable for marine seismic towing systems. We know that magnetic heading measurement sensors are usually expensive and difficult to apply in large quantities. The electronic compass HEC366 provides a very reasonable price while meeting strict towing module specifications. Unlike other heading measurement sensors that cost thousands of dollars, the HEC series, based on years of experience in designing and manufacturing heading measurement sensors from Huilian Technology, provides the most cost-effective solution for ocean towing cables.