The CI designation normally indicates internal GPS. I think all the 999's have internal GPS, so there should not be a 999 c model.
The 999 comes with the HDSI transducer standard and has a larger screen. You can use the HDSI transducer on the 899, but you have to give HB a call before you open the hardware bag that comes with the unit.....They will trade if for an upgrade fee.
Biggest screen that fits your budget is the way to go.


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