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Location: 31 | I use 2 helm units, and then mainly for trolling, I'm not sure if I could justify the extra expense if I was mainly a caster. It's a definite asset to have the bigger screens, with better options and details for precision trolling… a clear advantage for me on the water. I like the redundancy at the helm in case either unit goes down too.
My #1 helm unit is designated structure scan (down and side), with the side scan screen feature maximized for better detail off either side of the boat. My #2 unit is designated GPS/sonar, with the GPS screen maximized for a larger viewing area, the sonar on the second unit is kind of redundant while the down scan is running on unit #1 while trolling (sometimes it's helpful to confirm what's being displayed on the other unit too).
However, once on plane the unit #1 structure scan function shuts down completely, so the sonar on unit #2 is needed for depth, it's also convenient being located right alongside the GPS while running. I do a lot of flipping through options on the GPS while trolling, and can do this seamlessly while viewing/fishing with the other unit. A really nice unforeseen side benefit for me is being able to use unit #1 to rest my arm on while operating/programming the GPS on unit #2 above.
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