I'm not really sure if they will interfere with each other or not. The SI beam are really thin and are normally directed out to the side of the boat at a right angle to the path of travel of the boat. But I don't see any reason to run them both at the same time in SI mode. Well you could run on to the right and the other to the left in single side modes.
Each Humminbird unit can be told to scan both sides or one or the other side at a time.
And you could easily use some of the Humminbird models in 360 mode if you purchase the 360 accessories, but that would be very expensive. One could be mounted up front using the accessories and the other could be used in the back. The Humminbird 360 unit can be told to only scan certain sectors of a circle. So the one up front could be setup to scan forward in a 60 deg arc and the other in the back told to scan to the rear.
I would think that if you had two of the units hooked up to the 360 accessories and both were programmed to scan a entire 360 sector that they would probably interfere with each other. That's a good possibility in SI 360 full mode with two units running close to each other.
But if you have two Humminbird units that are running in 2D mode they should work together one at the front and one at the rear.
I have two Humminbird units, one LCR8000 running in 200 KHz mode 2 d and the other a Humminbird 898 C SI unit that can run in 83 KHz or 200KHz or 83/200 KHz at the same time in 2 D modes.
In 2d mode I've run them both at the same time. One transducer on the front trolling motor and the other transducer on the rear of the 16' long boat. I have the LCR8000 up front with it's transducer mounted on the bottom of the trolling motor. The 898 C SI unit's transducer is mounted on the starboard side of the transom.
I'd recommend that you call the manufacture of the units and ask them this question to find out for sure. If you can't just buy the boat without the electronics then perhaps you could sell some of the electronics to someone.



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