ok, got a 598 for my birthday, thanks son. thing is I have two boats. I've located some places to get different parts, mounting brackets, power wires. The transducers have me confused. I have seen several different ones for sale, it looks like the xnt 9 si 18t is the one I need, but there is another one listed on amazon that says it will work with the 598, and it's $100 cheaper? this will be a trolling motor mounted transducer. I want to share the unit between the two boats but I want the same setup on both. Any suggestions for part purchasing?