Fig. 1

Schematic representation of a current flow vector (orange) (due to its speed and direction) being integrated to a given travel vector (blue). The x, y reflect the initial location of a dead-reckoned track, x2 and y2 are the resultant location following the integration of a travel vector (prior to current integration) and xxx and yyy advance these x 2 and y2 values a step further in the direction of the current flow vector. The dashed lines indicate the magnitude of the x and y dimensions of travel (both pre- and post-current flow integration) and the green line reflects the actual travel vector