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I went ahead and ordered a XHS 9 HDSI 180 T and installed it last week. Took the boat out yesterday and the side imaging detail is noticeably better. I also updated the software to the latest version. It could be my imagination, but the regular sonar views may even be somewhat sharper than before.I wasnt sure it would be worth doing with the small screen on the 598, but I am pleased with the change.