Author Topic: Any screenshots of deep fish at 125 plus feet? (Read 19161 times)

Idaho · « **on:** February 14, 2015, 01:56:01 AM »

I recently had my first outing jigging for lakers, deep from 125 to 200 feet. I have not used my 798 to fish at that depth before, and was not at all sure of what we were seeing on the graph. We certainly were over fish, as we finally, after trying all day, in the last half hour boated seven. They were caught off the bottom. Very few suspended fish were seen, and I could not distinguish with certainty what was showing on the bottom. The fish caught were in the 3 to 7 pound range.

I've never really learned how to use the unit well, and am now determined to get better. I didn't even know how to zoom in on the bottom. I've viewed as many tutorials as I can find, and ordered a dvd. What I have not found are screenshots of fish at that kind of depth.

If anyone has screenshots at the 125 and deeper zone or just tips on what to look for I would be appreciative.

rnvinc · « **Reply #1 on:** February 14, 2015, 09:57:57 AM »

This is from Doug's archive ...:

http://www.bbcboards.net/humminbird-image-interpretation/172540-humminbird-si-screen-captures-100-plus.html

It is not uncommon for the higher frequency sonar types (DI/SI at 455kHz and 800kHz)...to just diminish into deeper depths ...

That's just the laws of theory in sound waves thru water ...higher frequencies don't penetrate depth as well as lower frequencies ...

Even the expensive professional sidescan uses of mapping depths ... Is done with a towfish to get the xducer closer to the target ...

SI does work at deeper depths ... When there is good reflective targets that can return the sound pulse to the xducer ... Note : the sound pulse is continually diminishing on the entire travel to the target - and returning from the target ...

Rickie

Idaho · « **Reply #2 on:** February 14, 2015, 01:20:07 PM »

Thanks for the heads up on that forum. I explored it some, tons of info. That thread requesting deep screenshots got no attention so perhaps I'm on a wild goose chase.

I got SI imaging even at 200 but assume seeing fish at over 100 would be unrealistic so its the 2D I was looking for. I did read enough to know its the lower frequencies that will provide depth capability but perhaps the loss of detail at that frequency limits seeing individual fish.

If I should be limiting discussion to SI on this forum let me know.

Idaho · « **Reply #3 on:** February 14, 2015, 02:16:23 PM »

I did find this on that site in this thread:

http://www.bbcboards.net/humminbird-sonar-gps/172968-all-sonar-information-resource.html

Very interesting that a jigging spoon shows up that way at that depth. This tells me I should be able to see what we were catching if I get the settings right.

Humminbird_Greg · « **Reply #4 on:** February 14, 2015, 02:41:56 PM »

Idaho,
If you look around this website, some more you will see that it more than just Side Imaging sonar. So no problems on the non-Si sonar questions.

Idaho · « **Reply #5 on:** February 15, 2015, 01:49:46 PM »

Thanks Greg. I will indeed be trolling around these pages.

liketrolling · « **Reply #6 on:** February 17, 2015, 08:35:49 PM »

I fish for Lakers at Flaming Gorge in utah and WY. and sometime you can't see them on 2d and I zoom in on the bottom, at 120 ft. the lakers are 20lbs plus
I talked to a guide about this and he said he could not see them this time of year, on his finder. but we still catch them.
I have a 998 si. I just bought a onix. was fishing feb. 6 and saw the lakers on the bottom with both the 998 and the Onix. I hit mark to make a waypoint thinking I would get a snapshot. I marked 3 way points but no snapshots. I had it set to save to card slot 1.. Maybe I need to hit mark 2 times, It did set MOB.

Idaho · « **Reply #7 on:** February 17, 2015, 10:05:36 PM »

Very interesting that the guide does not see them. Any idea why he can't and you did? I wish your screenshot would have worked, would love to see it. Lakers up to 30 lb are not totally rare in this lake, and I imagine they would show but I'm not sure about the more numerous 3 - 10 pounders. I'm guessing they may be laying right on the bottom limiting ability to distinguish them from bottom.

I didn't know how to zoom but intend to try it out next time. Was it zoom that let you see them? I was also thinking the whiteline bottom mode may help.
I'm about to view an instructional dvd on the 700 series. Hope that gives me some insights.

Do you see things better with the onix?

I think you should be able to sort out the screenshot issue with the unit out of the water. Maybe Greg will chime in.
Thanks for the input.

rnvinc · « **Reply #8 on:** February 17, 2015, 11:40:32 PM »

Quote from: liketrolling on February 17, 2015, 08:35:49 PM

I hit mark to make a waypoint thinking I would get a snapshot. I marked 3 way points but no snapshots. I had it set to save to card slot 1.. Maybe I need to hit mark 2 times, It did set MOB.

To save a screenshot on the 998 ... There must be a SD Card in the unit ...Screenshot must be enabled under the Accessories tab in the main menu ... Then pressing the "Mark" button will save the screenshot To the SD Card ... and create a waypoint at the GPS antenna location ...

To save a screenshot on the Onix ... Press and hold the "GoTo" button ...

Options for where to save the screenshot in the Onix are detailed on page 178 of the Onix manual ...
http://www.humminbird.com/WorkArea/DownloadAsset.aspx?id=3131

Rickie

liketrolling · « **Reply #9 on:** February 18, 2015, 12:56:33 AM »

Your 798 should be the same as the 998
power it up hit Menu go to Simulator, then hit Menu 2 times, go to Sonor go down to beam select
make it 200/83 Hz (when you get back on the water see which is the best.) go down to Switchfire
change to Max mode..

Then go back to top tool bar and go to Views, then go down to Sonar Zoom View make sure it is Visible.
Hit exit 2 times to get a chart, then hit view until sonar zoom view comes up it is a split screen
with a box on the right side.
Then hit menu one time, you may need to change the Sensitivity to 5, sometimes you need the sensitivity high to see the fish and downrigger balls
another view to look at is the split screen of 83khz on the left and 200 on the rt.
Hit menu one time go to upper range and change it to 60 ft That way you will not see the top 60ft of water. When you want to fish the top water set it back . (When I fish for Kokanee in the summer I set the top to 25' and the bottom to 80') I like to see the downrigger balls if my lure is diving 15' I will keep the ball 15' above the bottom when fishing for lake trout.
The 998 was marking fish as good as the Onix. But will see when I move to another part of the lake where the fish are hard to see. I moved the 998 transducer up to the front trolling motor.
When both are on I get interference. But I can live with that.

Idaho · « **Reply #10 on:** February 18, 2015, 05:34:50 PM »

Thanks for the tips. I will be trying out the zoom mode with high sensitivity. I'm also considering a 2nd unit run off my terrova trolling motor transducer up front. I hope to get screenshots as well.

liketrolling · « **Reply #11 on:** February 19, 2015, 12:41:29 PM »

Old snapshots from the 998

Any screenshots of deep fish at 125 plus feet?

Idaho · « **Reply #12 on:** February 19, 2015, 03:45:13 PM »

Very cool! Looks like you were capturing after all.

Not much doubt about what's down there. Fish show well even without zoom. Looks like they are stacked up in some of the shots but if I understand it right, the 83 khz beam would be about 100 ft wide and everything picked up from that width will show superimposed so they could be quite spread out.

On the 2nd from bottom split screen are you showing Max mode and clear mode side by side, or 83 and 200 khz beams?

Looks like you were running along a dropping shore line where it levelled out?

Humminbird_Greg · « **Reply #13 on:** February 20, 2015, 08:09:11 AM »

It would be the 83kHz and 200kHz side by side in the Split Sonar View. The unit does not have the capability to display different SwitchFire menu settings at the same time.

Idaho · « **Reply #14 on:** February 20, 2015, 11:59:17 PM »

Thanks those shots help a lot.
It would be fun to see a pic of your catch.

Not sure how soon I'll get out as it's a fair drive to Priest from here. It's been so warm I imagine a spring pattern could be started, maybe shallower fish.

bobcoy · « **Reply #15 on:** February 21, 2015, 12:10:38 PM »

As far as the large cone at 100": The bright colored ones are close to the center of the cone. The rest are out wide. Bob

Idaho · « **Reply #16 on:** February 21, 2015, 12:54:12 PM »

OOPS, didn't note the prior response was from Greg.

Quote

It would be the 83kHz and 200kHz side by side in the Split Sonar View. The unit does not have the capability to display different SwitchFire menu settings at the same time.

I can see the 83 kHz to the left on the first screenshot, and it looks like the 200 is buried in the color on the right so that makes sense. Looks like 200 is still giving better images at 90 feet. Since the unit is supposed to function to 1500 feet I'm guessing its deeper where the 83 KHz has value. I don't recall seeing the bottom displayed deeper than 300 or so with mine.

For depth reporting, and drawing the bottom, is the unit averaging the signals from across the entire beam? I'm guessing it uses the narrow 200 KHz beam for this?

Humminbird_Greg · « **Reply #17 on:** February 21, 2015, 12:58:10 PM »

I believe that the unit reports the shallowest 200kHz signal as the digital depth, but it will display the all of the 200kHz sonar returns of the bottom (and 83kHz if that is set to be displayed).

Idaho · « **Reply #18 on:** February 21, 2015, 03:39:59 PM »

Thanks Greg, and Bob. You guys make this site a great learning tool.

Idaho · « **Reply #19 on:** March 09, 2015, 09:07:41 PM »

Found a school of whitefish at 160 - 180 depth. We managed to get a few jigging using an electric troller on anchor setting. Very tricky subtle bite.
While many consider these a trash fish, they are in fact excellent table fare, any way you prepare them, including smoked.

No trouble seeing them, a massive school stacked up to 50 feet of solid fish. Unfortunately I did not have a card for image capture. I plan to get a card before the next outing. Images with 200khz were crystal clear even on high sensitivity, 83 kHz generated a lot of background fuzz. Might need to figure out how to adjust individual sensitivities. For some reason I got good depth readings in water over 1000 feet deep this time. No idea why.

freezerfiller · « **Reply #20 on:** March 10, 2015, 08:41:49 AM »

I don't have any deep water like that where I live, but I fish for striped bass in around 60 ft of water, and if I locate them there, I'll often set my upper and lower depths to say, 30 and 70 to focus on where they are. When I do this, I will actually see the fish streak up to the bait. It's almost unfair because this happens about 2 seconds before the rod goes off and everyone just stares at the Humminbird instead of the rods! You might try setting your upper depth at 100' or so since your bait/lure is well below that.

Idaho · « **Reply #21 on:** March 10, 2015, 07:55:16 PM »

I'll give that a try. I'd love to see my lure on the finder. I really need a second unit at the back of the boat where the action is happening.

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