I have a hummingbird fish finder. It has 2 GPS accessories and all cabling to connect second fish finder.
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The problem is the sonar in the transducer has a short. The water temp works but a new transducer is needed.
For an older system it works great. It has navonics map. The GPS works great. This is ideal if you already have a system and would like to extend a second station to the front/back of the boat. Also willing to sell any parts separately.