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

**wasabi** · 02-13-2021, 07:02 PM

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?

**CrappiePappy** · 02-13-2021, 09:32 PM

Wasabi ... this is all I know :

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.

**rnvinc** · 02-13-2021, 09:58 PM

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

**wasabi** · 02-14-2021, 09:38 AM

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.

**CrappiePappy** · 02-14-2021, 12:28 PM

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 :

**Bricks** · 02-14-2021, 03:41 PM

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.

**Sped66** · 02-15-2021, 12:10 PM

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.

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

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