In 2 boats I have 4 of the 480 and one has gps in it. that one is up front on tm and I can watch fish come up and hit bait or go back down ,which one cannot do with DI, by the way I have di si also and I realise di on side scan is not as good as real di units ,in fact ,probable is me ,but running them both at the same time ,I see more fish on 480 than on si or di. This is not a insults to DI or SI but rather to my igorants of the new units