Looked it up. Looks pretty cool. Just a bit pricy for the module and looks awkward to use when running down the lake to me. But I'm getting old and not to cordanated anymore. Figure holding phone in hand and driving boat is accident waiting to happen. I guess it depends mainly how much information you are looking for or need. Installing a Tachometer would be much less expensive. I would download that free app to phone, go out in boat and try to play with it while running boat. It's not going to give you real data from your motor but would give you the feel of what it would be like to get info while driving. And that wouldn't cost you a dime.