Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I think that the Raymarine cp200 is just about what you need. See this page:
Would you prefer a Humminbird-made unit or set of devices? if so, let me know.
As for charts, just what part of the Hawaiian islands' waters do you or will you need charts for?
Let me know, please. Thanks.