Can I display both the instruments, ie heading and speed from the iphone internal GPS and show AIS targets at the same time. Also how do I display the analog instruments display.
iNavX either uses "Location Services" or it uses NMEA (including AIS) over TCP/IP. Running both at same time would be way too taxing on the small iPhone battery.
Analog instruments can be seen by going to the "Instruments" view and tapping for example SOG or COG or HDG. There are analog instruments for speed, wind, satellites, compass. Some require NMEA data.