Chart Speed effects on Side Imaging and Down Imaging

DougV · 05-17-11, 02:54 PM

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.

Bender · 05-17-11, 03:23 PM

I gathered this tip from you on one of your videos and it really helped me, I was running it too fast in the past. I sure wish:
1. SI and 2D sonar chart speeds were separate.
2. Chart speed was tied to GPS speed and adjusted automatically. This would of course need an offset so that you can still make fine adjustments, as well as a manual mode like it is now.

When I stop to fish I often turn my chart speed down to 1. When moving slowly with the trolling motor I can see what is down there.

05-17-11, 02:54 PM	#1
DougV BassFishin.Com Active Member Join Date: Aug 2010 Location: Truman Lake, MO Posts: 170	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. Last edited by DougV; 05-17-11 at 11:12 PM.

05-17-11, 03:23 PM	#2
Bender BassFishin.Com Super Veteran Join Date: Jul 2005 Location: Brighton, MI Posts: 2,414	I gathered this tip from you on one of your videos and it really helped me, I was running it too fast in the past. I sure wish: 1. SI and 2D sonar chart speeds were separate. 2. Chart speed was tied to GPS speed and adjusted automatically. This would of course need an offset so that you can still make fine adjustments, as well as a manual mode like it is now. When I stop to fish I often turn my chart speed down to 1. When moving slowly with the trolling motor I can see what is down there.

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