If you want to get navigation and AIS in a single App, then check pasado SeaPilot.The standard SeaPilot app includes full navigational functions, with the ability to download world-wide nautical charts to your device. This app allows you to connect your device with your boat’s onboard NMEA-compatible sensors via WiFi, http://martinfmook.timeblog.net/21115348/navigation-compass-for-boat-para-tontos