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Electronics help

Freshwater 
882 views 0 replies 1 participant last post by  oldreb1343 
#1 ·
So I have two units on my boat I have a Helix 7 chirp di g2n at the bow And a helix 9 chirp di g2n at the console. I would like to have Si sonar. Is there a way I could add that to my existing units or do I need to buy a new one ?
 
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