Saw an option today if you own an iPad. There is a device now that takes NMEA 0183 and converts it to WiFi and can send it to an iThing. Allows you to see all depth, speed, etc. With the Navionics app, it acts like a chart plotter plus it can show AIS data. On top of that, you can listen to tunes and post here...
Device is called an iAIS.