Another question about fish finders

[RipNLips]

Low frequencies travel through water great compared to high frequencies, however, you can't detect the detail with low frequencies that you can with high frequencies. The wattage available in fish finders nowadays is huge compared to what was available only a few years back. Wattage can be compared to volume. If you talk (low wattage) into a deep rock canyon, you may not here an echo at all. If you YELL (high wattage) into a deep rock canyon, you'll probably here a great echo. The old low wattage units needed to use low frequencies to detect objects at great depth. The poor detail was better then not being able to detect objects at all when using a higher frequency. The high wattage units available now days can detect stuff at great depths even with high frequencies. Nowadays I think the low frequency option is primarily useful if you plan on fishing deep oceanic trenches. However, there are probably other uses for low frequencies such as for penetrating very muddy water.
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