Before you do this problem review the elevator problem. There, the key idea is to write the equation for the forces acting on the person on the elevator:
N-W=ma
where N is the normal force: the force the scale is exerting on the person, and where a is the acceleration of the person. The scale "reads" the force exerted on it which is the normal force N.
So for the person on the boat you have 3 force measurements. One is when the boat is stationary, which should give you the persons weight, and therefore mass. The maximum force measurement (220 lb) should give you max acceleration etc. make sure you convert lb to Newtons.
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