Al Millan wrote:LCX-18. Wow that's a tiny little guy.....6 inch screen. If I recall correctly, the resolution is only 320 x 240 pixels. If you're looking to find kokanee, that would be tough to do. I don't believe swapping out your tranducer to an Airmar P66 would help much. It's like connecting an expensive HD video processor to a 14 inch TV set with picture tube. The Airmar would send strong signals to the LCX-18 but the screen won't justly represent what it sends.
The Lowrance units come with Navico transducers which, for most applications, are good transducers. Mine shows kokanee and stripers just fine, however, I'm also using a 10.4 inch screen with an 800 x 600 screen resolution. The finer pitch does a lot better job of displaying echo returns.
I'm a big advocate of big screen sonars primarily for the finer screen pitch and higher resolution. With a bigger screen, it would definitely be worth the upgrade to an Airmar transducer. Airmar transducers are very powerful, some are bulky, and can get pretty pricey. For fishing lakes and rivers, I don't necessarily think it's a must to have one of the upper echelon transducers. Those are primarily designed for deep ocean water applications. The P66 is the cheapest (pricewise) transducer with Airmar makes for the Lowrance brand. But don't let the lower price fool you as the P66 has better resolution than the Navico transducers.
All that being said, I would recommend an upgrade to at least an 8 inch screen which is also 800 x 600 pixels. The pitch isn't as fine as a 10.4 inch screen, but the ability to properly display good echo returns is there.
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