During the anniversary round-the-world expedition of the R/V “Admiral Vladimirsky”, the magnetic field components were measured using two 3-component magnetometers with torsion and magnetoresistive sensors developed at SPbF IZMIRAN. In total, about 60,000 linear kilometers were covered with the measurements. Testing of the obtained results was carried out by comparison with the data obtained on the non-magnetic schooner “Zarya” in the Gulf of Finland and the Bay of Biscay. For the first time, the hodograph method was used to determine the horizontal H component. In particular, this method was used to estimate the position of the South Magnetic Pole. The obtained results showed that despite the complexity of magnetic measurements on a ferromagnetic vessel, such a survey is promising, but further development of the data processing method is required.