898c SI for Charts only?

Anything Related to the Humminbird 11xx, 9xx, 8xx, 7xx also known as CORE series Units
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Joined: Mon Mar 01, 2010 4:52 pm

898c SI for Charts only?

Post by RivRunR » Tue Feb 28, 2017 12:54 pm

Since I'm getting a Helix, I want to use my old in-dash 898c SI for charts / navigation only.
Do I need to connect it to the transducer for any reason (like speed ?), or will the external GPS receiver take care of everything for displaying charts?



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