With the itc5, you directly connect your analog sensors (windvane, depth, and log transducers) into the itc5. It outputs the data onto the NG network, and you can see all that data on you axiom, as well as any other nmea2000/NG capable instruments. Obviously, when you do this, your old instruments are no longer getting signal, and won show any info.
The transducers your old instruments use will work just fine with it. While I’m no sure about non-raymarine wind transducers, analog depth and paddle wheel
transducers are basically interchangeable- if you look at airmar’s catalog, the same transducer has something like 20 different part numbers, depending on who’s connector is on the cable. (And you terminate bare wires to the itc5, so you’re cutting of whatever connector anyway. I’m fairly sure the major manufacturers simply relabel airman transducers to begin with)
An alternate path, as stated above, is to get a sea talk to NG converter, but now you are dépendant upon the old instruments to convert transducer signals to seatalk( nmea18whaever), and the converter to change that into NG.
I say toss the old instrument(s), get an itc5, and you can pick up an i70 to put in the hole(s). The i70 will show you whatever data you want, including wind.
I have this exact setup - tastes great, less filling ;-)
I usually leave the i70 displaying wind, as I have depth and speed already on the axiom in the corners, but will switch it over to full screen
depth numbers when I’m headed somewhere shallow.....