Question for side imaging gurus

**Cane Pole** · 02-20-2010, 12:07 PM

Originally Posted by bob baldwin

Sometimes fish make good shadows even when the boat isn't moving.

bob baldwin
bryan, texas
997c SI
1197c SI
AS GRHA GPS

My opinion, but I believe the boat would have to be moving somewhat to get a full image based on the SI narrow beam.

**jaxsprat** · 02-20-2010, 01:35 PM

Originally Posted by Cane Pole

My opinion, but I believe the boat would have to be moving somewhat to get a full image based on the SI narrow beam.

As long as the fish is moving U will get full image as he/she swims through he si beam especially if the fish is swimming parallel to si beam.OOPS I meant to say fish is swimming parallel to the boat not the si beam, this way the si beam would pick up the whole side & length of the fish sorry

**Cane Pole** · 02-20-2010, 01:43 PM

Originally Posted by jaxsprat

As long as the fish is moving U will get full image as he/she swims through he si beam especially if the fish is swimming parallel to si beam.

Ima dummy.

**jaxsprat** · 02-20-2010, 01:56 PM

Originally Posted by Cane Pole

Ima dummy.

Ain't no dummies when it comes to sidescan, just some roads/trails we haven't walked yet.

**Cane Pole** · 02-20-2010, 05:56 PM

Originally Posted by jaxsprat

Ain't no dummies when it comes to sidescan, just some roads/trails we haven't walked yet.

I'm used to observing strait lines and arches.

Even when trolling slow (.2-.4 mph) I have never seen a shadow that well defined. Usually the screen objects are just long lines of macaroni noodles at these slower speeds.

I am gonna pay more 'tention. However,with the gps showing a donut at the slower speeds, I have a tendency to ignore the screen.

Learn somethin' every day.

Right now, there are not to many fish to look at with the si sitting on my desktop.

**bob baldwin** · 02-20-2010, 08:27 PM

I've taken lots of these while fishing at anchor for channel cat.

bob baldwin
bryan, texas
997c SI
1197c SI
AS GRHA GPS

**Cane Pole** · 02-20-2010, 08:52 PM

I have never see this type shot. But, I have seen lots of that spaghetti in the background.

I will start paying more attention for sure.

**CrappieCrazed** · 02-21-2010, 12:23 PM

Originally Posted by bob baldwin

I've taken lots of these while fishing at anchor for channel cat.

bob baldwin
bryan, texas
997c SI
1197c SI
AS GRHA GPS

I would say it definetly has to help that you are only in 6 feet of water and only looking out 25ft to each side. I wouldnt think it would show up nearly that nice if the si was looking out further and you were in deeper water. That is very impressive especially because I am a catfisherman myself. Was that shot taken in a river, lake, what?? Nice screen shots!!!

**bob baldwin** · 02-21-2010, 12:46 PM

Correct - you need the fish pretty close to get these images. I took these in Lake Somerville, Texas behind Deer Island. I missed recording the best ever when a carp type fish went by and I could make out it's sucker mouth. In this shot, the boat is rocking slightly making the gps think it was moving. The puck is about 8 feet above the water.

bob baldwin
bryan, texas
997c SI
1197c SI
AS GRHA GPS

**TN Hillbilly** · 02-24-2010, 11:44 AM

OK, I think maybe I understand how this works now. The sonar data is used to render a pic of the objects detected to show things from a side perspective. The sonar beam doesn't come directly from the side, it comes at an angle from the surface out toward the bottom. The data received is then processed to create a view showing a rendered view from the side. That's what allows the user to see shadows of returns. The returned data is used to draw a pic of the bottom, and anywhere there isn't a bottom return is filled in with a shadow. Anyone call bull to that?

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