ClearVu - When to use 455 vs 800khz for Garmin GT-20 transducer?

I have a new Garmin Striker Vivid 4cv going on my tiny 8’ bassbaby boat. It has a 77/200 khz Chirp but the 455/800 khz Clearvu downscan will be new to me. The product documentation doesn’t do a good job of explaining when I might select either the 455 or 800 frequency. Are there any general guidelines?

With my 77/200 I tend to choose either frequency based upon the size of the cone I want under the boat - selecting 77 when I want a wide cone view under the boat and 200 when I want narrower to see directly under the boat.

Is this the same for the ClearVu? Choose the lower frequency for a wider view and higher frequency for narrower?

Wasabi ... this is all I know :
http://i826.photobucket.com/albums/z...ps23dd749d.png

In general terms, 455 kHz will give you a longer useful range than 800 kHz. ... Also, in general terms, 800 kHz will provide a slightly higher resolution image than 455 kHz.

I used the 800kHz frequency on my Lowrance Elite 5 DSI, and still use it on my Hook 7 ... image quality was/is better, plus knowing that the 800kHz has a 45deg angle tells me that when I'm in 20fow the beam is about 16ft wide at the bottom.

My general recommendation is to use the highest frequency possible for better detail ... up until the point that maximum gain/sensitivity can no longer brighten the image (or targets) to your liking ...

Then switch to a lower frequency and re-adjust gain/sensitivity ...

Rickie

If my lake has little structure should I stick to just conventional sonar? I tried downscan overlay and didn’t seem to be helpful. May be I wasn’t doing it right.

I don't know about you, Wasabi .... but once I got a DI unit, I quit using 2d sonar completely. I don't even like DI/2d overlay screen either, it's just too "busy" (cluttered) for my taste.

This is a screen shot from my Elite 5DSI unit - and the reason why I stopped using 2d sonar :

https://www.crappie.com/crappie/atta...-screen002-jpg

I use my 2D more then DI when it comes to actually fishing as I can watch my jig and see fish come up to it. DI is a flat signal where 2D is round which gives me more opportunity to watch my jig.

Quote:

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Originally Posted by Bricks

I use my 2D more then DI when it comes to actually fishing as I can watch my jig and see fish come up to it.

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^ What he said. I have a 93 plus though, so I use split screen running 2d & CV at the same time.