LucG Posted June 17, 2011 Report Share Posted June 17, 2011 Hey Guys, Can anyone help me understand what frequencies are ideal for certain situations. I've just purchased a Garmin 500c and its uses either 200kHz or 77kHz. I've noticed, when using the split frequencie screen that one seems to mark better arches while the other seems to have better bottom definition. Is it as simple as that or is there mor to it. Is it better to use one vs the other when in deep/shallow water. Thanks Link to comment Share on other sites More sharing options...
Dan668 Posted June 17, 2011 Report Share Posted June 17, 2011 (edited) 77 penetrates deeper water better than 200. The cone is also bigger meaning it will depict fish/structure easier in deeper water. Edited June 17, 2011 by danbob Link to comment Share on other sites More sharing options...
Roy Posted June 17, 2011 Report Share Posted June 17, 2011 200 KHZ will give you the best definition. It'll give you minute details of underwater structure including fish. 50 - 90 KHZ give you much greater depth penetration but less definition. Link to comment Share on other sites More sharing options...
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