A marine vessel navigation control apparatus includes a constant-speed
navigation controller and a trim angle controller. The trim angle
controller includes an evaluated-value calculation module which
calculates evaluated values of a trim angle, an information storage
medium, a statistical model creation module which creates a statistical
model using the evaluated values stored in the information storage medium
as an explained variable, and operation information including the trim
angle as an explanatory variable, a target trim angle calculation module
which calculates a target trim angle based on the statistical model, and
a statistical model storage medium which stores parameters of the created
statistical model.