To get data from your boat's instruments into your app, you need a device to take NMEA data and send it out over Wi-Fi.
We've developed a low cost device that does just that, and it is available on Kickstarter, but closing on Wednesday 5th July at 1545 (UK time).
For more information, have a look at http://www.nmeatools.com or https://www.kickstarter.com/projects...3-wi-fi-device