Well just pick up an hummingbird 859 ci HD DI with south East map card which it had, but as usually no transducer..hope to pick one up which shows XNT9 DI T.would work but it shows two others XTM 9Dt 25 T and XTM 9 wide DI 20 T mush be something new?try to get fish finder were I can see mostly speed and dept when I fish,the garmin I have can’t see the numbers on it due to eyes not as good as they use to be.don’t know any thing about this fish finder shows self test as past and somehow 27 hours total,can any body reset the hours on the units are just hummingbird.well hope it works out.just looking for any info on this unit would help thank you