I'm planning on purchasing the 898 or 998 si unit this week a question I have is the information that I've been reading says that both units are 8000 watts peak to peak. But the 898 only has 4000 watts p2p. As far as I understand is it's based on the transducer, so does that count for 998 unit also and both of them actually only produce 4000 watts p2p. I don't plan on doing much over a depth of 125 feet, so I don't need the tighter cone. But what is the difference. And as an option for a second boat to move the unit back and forth what transducer, power cord, and GPS item numbers will I need for my second boat in order to switch the unit to a second boat.