I am currently running a Lowance Elite 5 sonar/DI/GPS combo that I bought new 2 years ago in the console area of the boat and would like to put a similar unit in the bow that I can see while fishing. Cabellas currently has a great deal on my unit without the GPS which would fit my needs perfectly. My question is is it OK to run the two of them together without interference? Someone suggested that I can only run one at a time or else they will interfere with each other, is this true? Also I think I would want to mount the transducer to the trolling motor but I wonder will I have to shut it off when I pull the motor up to change spots or can I just leave it running out of the water? Just a couple things I wanted to confirm before I waste a couple hundred bucks on something that won't work for me. Any advice you could give would be appreciated. Thanks.

Nobody can tell you if they will interfere or not, its different with every setup. There is "noise rejection" on the sonar menu that may be able to tune it out. If not, simply hit the "stop sonar" function when not using the console (cant be at two places anyways!). You can run it without the transducer in the water, no problem. When the transducer on the trolling motor is out of the water there will be no interference so you wont have to "stop sonar" on that one.

 

Fyi cabelas sold out of that unit on monday night, and rightfully so! That was a hell of a deal, glad i got one. By the way i am rigging it the same way you wanted to- its going on the bow and i already have one on the console. 

Now that my new elite 5 arrived i can tell you that i have no interference between my two lowrances. I have them both on the same power cord even, which is usually a huge no-no but surprisingly it worked just fine. So dont hesitate to pick one up if you see it on sale. 

Excellent info, thanks a bunch! Killing me that I missed out on that sale but I'll get one next time. 

Where I used to run in to interference is when the signal cones from the front and back transducers (operating on the same frequency) crossed.  For my installation,  this happened in water 20' and deeper.  The front sonar would read double the actual depth with small horizontal lines scattered on the screen.  The rear sonar would read the correct depth, but wound mark no fish.  I fixed this by operating the sonars on 2 different frequencies. 

Oh wow, great tip. Never thought of the beams crossing like that but makes perfect sense.