I have not figured a way to make it talk to Navionics. I am no electronics pro!! I am happy with the units and the mapping which I did upgrade. What the mapping does not have are all of the house foundations and that kind of stuff pre loaded. I am glad to see they have the fishing hotspots(they may have had this for a while but it is new to me)I will be downloading that very soon! The images and all of that work great out of the box. What I liked was the fact that I did not need extra boxes or cables or anything to make them work. I installed them, followed instructions to update software, and went fishing. My kind of stuff, turn it on and it works. I will say that if you want to read depth while on plane, you need a shoot through hull transducer and a different unit. Mine works up to about 7MPH without distortion which could be where I located my transducer but I have heard others give similar results. GPS, time, water temp, all that stuff is great and all really easy to figure out even for a dummy like me.
See you on the lake and have a great day!