Chart Speed Effects on Side Imaging and Down Imaging

[Doug V]

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...

Adjsuting your Chart Speed will help you get your images jsut 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 fucntion is probably the Most Improtant 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 strech them a little to see more seperation 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.

 

[wbwilly]

What chart speed are the better pics?

 

[EricM]

I can see some of the mistakes I've been making when I slow the boat way down. Perfect illustrations! Thank you!!

 

[tnfatguy]

Great post! Thanks for the info with pics.

 

[Doug V]

wbwilly - 5/17/2011 4:25 PM

What chart speed are the better pics?

Since I'm running in the 3MPH range all the better images are run at Chart Speed 3 to Match Boat Speed.

 

[Doug V]

Now Switchfire 2D Sonar...

Matched to boat Speed...

Too Fast... (elongates returns)