I just have to ask, where are you located at? If you are in the USA, then using this radio in a factory stock condition on both MURS and Marine frequency's is illegal as hell.
MURS is limited to 2 watts of out put power but can be used with external antenna.
As for the marine, it is illegal to use marine frequency's in any course of action that is directly not connected with marine activitys and radios are to be type acepted under a differant set of standards.
So, I guess I would say that if you are using this radio in both of these services, you are illegal
Beside all that, for the most part, why would you need PL if you are trying to talk to a bunch of truckers, (who are also using illegal equipment)?
As for the programing of the pl it is called Sub Audio and is the column to the right of the transmit frequency.
Until you get all the information loaded into the program and then loaded to the radio, you DO NOT want to do ANY alignment, which you need a communications service monitor to do it any way.