Side Imaging Forums > 997c SI, 998c SI & 999ci HD SI

What is the difference between the 999ci HD and 999si HD?

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2DirtyKids:
What is the difference between the 999ci HD and 999si HD? What does the SI and CI mean as I am unable to find a comparison online.

ezfishn:
The "C" indicates color display and "I" indicates internal GPS.  As far as I know, there was only one model of the 999 which was the 999ci HD Combo model.  The earlier series xx8, xxx8 models did not have internal GPS.  You would still have capability to use an external GPS receiver with all models including the current models. 

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