Chart Speed effects on Side Imaging and Down Imaging - California Bass Fishing Forum
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Old 05-17-2011, 02:50 PM   #1 (permalink)
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Default Chart Speed effects on Side Imaging and Down Imaging

Here are some examples of the effects of not adjusting the Chart Speed to match the boat speed and how it can distort the data.

Chart Speed matching Boat Speed...see the details?



Now the Chart Speed increased and loss of resolution and stretching of data...



Same thing happens with Down Imaging...

Too Fast...



Still a little fast...



Just Right...



Now Switchfire 2D Sonar...

Matched to boat Speed...



Too Fast... (elongates returns)



Adjusting your Chart Speed will help you get your images just like the images are naturally positioned under the water. To fast will stretch the images and too slow will shrink the data. Using the Chart Speed function is probably the Most Important element in creating picture perfect images. I try to match or drop a 1 number below chart speed for higher resolution images if you want to stretch them a little to see more separation of details adjust 1 or 2 numbers above boat speed but don't crank it up it will make the images lose alot of the resolution to the images.
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Old 09-20-2011, 11:27 PM   #2 (permalink)
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Default Re: Chart Speed effects on Side Imaging and Down Imaging

So, Are you saying if you run the boat say 4mph setting will be about 5?
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Old 09-21-2011, 11:21 PM   #3 (permalink)
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Default Re: Chart Speed effects on Side Imaging and Down Imaging

I recommend starting with matching the boat speed to Chart speed to keep the aspect ratio natural. Idle 4mph set chart speed to to 4.

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Old 09-22-2011, 08:46 AM   #4 (permalink)
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Default Re: Chart Speed effects on Side Imaging and Down Imaging

Thanks.
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Old 10-31-2012, 11:17 AM   #5 (permalink)
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Default Re: Chart Speed effects on Side Imaging and Down Imaging

Doug,
I have the 997 from six+ years ago.
Once I get on plane, I lose my conventional sonar signal, but my side imaging still reads fine.
Is there something I can do to get the sonar to work at higher speed, too?
Mark
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Old 10-31-2012, 01:18 PM   #6 (permalink)
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Default Re: Chart Speed effects on Side Imaging and Down Imaging

Are you running just the SI Transducer or you running an additional transducer with Y Cable?

If single transducer you need to adjust to get clear water flow. If SI Works on plane then you probably need to raise transducer. Can you post a picture of the Transducer install?

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