The jack plate is usefull in shallow water operation as well. If you wish to get on plain in shallow water you can raise the jack plate and as you begin gettin on plain you lower the jack plate at the same time. The jack plate is also usefull to prevent cavitating. Normally you would trim a motor up after plainning but in some chop you may begin to cavitate when you trim up too much and the prop is above the cavitation plate. With the jack plate you can leave the motor trimmed down enough so that the prop is below the cavitation plate which will help the boat have a smoother ride. A jack plate is good for increasing fuel economy as well because if you can raise the engine out of the water more you will have less drag on the boat and get more speed with less effort by the engine.
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