Re: jack plates
theres fixed, manual and hydraulic
fixed is cheaper but is a pain to set up as the motor is heavy and its not easy to adjust but once set will work fine.
manual is no better than a fixed except it is easier to set up and has fine adjustment where a fixed only allows you to move a hole at a time (some one will tell you that they marked the plate and reset depending on where they are fishing or what they are doing but thats hard work realy)
hydraulic is the best but it costs alot. just like trim it can be adjusted on the fly so you can change the set up depending on what you are doing. when running in shallow water you can also lift the motor.
the hydraulics are the same as the ones used on the tilt trim of the outboard so they are ok in salt water