my co writers are so right... it all depends on what you would like to do in/with your boat/ship..
but to answer the question... NO there is no Transmitters dedicated to Boats..
but.. spectrum was at one stage working on something like that..!
and there was or is a firm in Germany that would like to bring out a Transmitter just for boats..
those "Model Types" are just examples of Programing in Computer aided Transmitters, for example the "V" mixer in the Airplane program can be used to mix two motors so you have control like the P94 from Action.. Tank steering and the likes of..
it all comes down to, what would the individual like.. the options are endless, so as the amount of channels to control ..