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The 198 has the sounder and split screen, 192 does not. A thread on thehulltruth.com gives a lot of info on the 198c. The recommendation is to buy the unit without the transducer that comes with it and get Garmin's P66 transducer instead. Like you I don't know much about electronics so I am just repeating what I read.
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Patrick
Boston, MA
03 Triumph 210cc
140HP Suzuki 4s
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