Taking magnetic deviation into account when it is measured at a moving object

The works devoted to taking magnetic deviation into account on vehicles are reviewed. Different methods for taking deviation into account are presented. These methods can be conditionally divided into three groups: the usage of parameters of magnetic deviation measured at sites, compensation for vehicle deviation using different methods, and removal of magnetic sensors to a certain distance from a vehicle. A substantial disadvantage of all methods consists in that it is impossible to determine deviation in an on-line mode. The on-line technique for determining deviation of magnetized bodies developed by us is briefly described.