| CPC G05D 1/0206 (2013.01) [B63H 20/12 (2013.01); B63H 21/213 (2013.01); G01S 19/42 (2013.01)] | 21 Claims | 

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               12. A propulsion control system on a marine vessel, the propulsion control system comprising: 
            at least one propulsion device configured to propel the marine vessel; 
                a control system configured to: 
              based on a lock control instruction designating two locked axes and one unlocked axis out of a surge axis, a sway axis, and a yaw axis, define a movement track for the unlocked axis based on a current GPS position and a current heading, wherein the movement track is defined such that the marine vessel position with respect to each of the two locked axes is unchanged; and 
                  control at least one propulsion device to move the marine vessel on the movement track based on a thrust command input while automatically maintaining vessel position with respect to each of the two locked axes. 
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