Is HBird DI just a "me too gimmick"?

Just a question. I bought last year and just sold an HB DI unit. I used it on the Chick mostly in shallow water [under 20'] and most of the time in split with the 2D SwitchFire. After using it for awhile I came to the conclusion that, because of the way the DI signal is presented in MOST cases, it is of little added benefit. I had believed when I purchased the unit that it would give me a picture of what was "around" the boat and not just what was under it. In shallow water, that is not the case. It does cover a somewhat wider area than the 2D BUT because it scroll from rt. to lft. like the 2D, objects cannot be pinpointed as to their position relitive to the path of travel. If you scan something that is revealed to be a treetop, stump or brushpile, the only way to know with any certainty where it is, is to run back and forth and scare any fish or fan cast till you make contact. To me, the only way to enhance its usefulness would be to make it function more like SI and scroll from top to bottom. At least that way you could tell the objects position as related to boat path. Just my thoughts and opinion!

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Originally Posted by TNAMBUSHER

To me, the only way to enhance its usefulness would be to make it function more like SI and scroll from top to bottom. At least that way you could tell the objects position as related to boat path. Just my thoughts and opinion!

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Please explain.

I need an explanation myself. If that would help you then just mount the screen sideways. Ha

You can use the formulas on the left side of this picture to help determine at different depths how far out your scanning.also if you don't see something on 2d but you see it on di you no that its out farther than your 2d cone .the best ways to no for sure exactly were an object is,would be si and /360 or sc/spotlighthttp://i826.photobucket.com/albums/z...ps23dd749d.png

I doesn't sound like there is an issue with the unit as you have described it. The principle idea of having DI in addition to 2D sonar is to gain a better understanding of the structure/cover you are seeing on the viewer. The position of the structure/cover relative to your boat could be off by as much as 20 feet depending on your setup. For example: GPS in and of itself can be off by 10 feet or so and if you have the GPS puck, or the unit with built in GPS at the console and your transducer sits at the back of a 20 foot boat, you can add another 10 feet. The more you use the HBUnit, the more confident you will be with how far the distance is between to structure/cover and your boat.

Down imaging works great for what it's intended for! It's sounds like you are in need of side imaging or 360, but there is nothing wrong with DI. It is intended to be a more detailed compliment to 2D and that's why it sells so well. Some on this site has experimented with DI on a pole mount and the transducer angled so the piezo is able to scan out in front. This may help you accomplish your goal. I assume you are fishing very clear water, if worried about spooking fish in the 20 foot range. In our area we can travel over structure in 10 foot of water easily without spooking the fish.

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Originally Posted by justinp61

Please explain.

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My unit did not have GPS. Look at the illustration posted by kos. The DI beam is wide but narrow similar to the SI beam. It achieves its enhanced target resolution by this concentrated beam. Why would it not be better to be able to see this enhanced detail from an overhead perspective. The SI units have Contour View where the "water column" can be removed and you only see the bottom and structure. Why not have the same view from the DI unit BUT just on a narrower scale? That way, you could have the ability to drop a marker on a target that appears 12' to the right of center and do so more accurately.

A "down" looking transducer cannot distinguish left or right. To determine that, you would almost need two transducers so the unit could then split the two signals the way SI does.

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Originally Posted by TNAMBUSHER

My unit did not have GPS. Look at the illustration posted by kos. The DI beam is wide but narrow similar to the SI beam. It achieves its enhanced target resolution by this concentrated beam. Why would it not be better to be able to see this enhanced detail from an overhead perspective. The SI units have Contour View where the "water column" can be removed and you only see the bottom and structure. Why not have the same view from the DI unit BUT just on a narrower scale? That way, you could have the ability to drop a marker on a target that appears 12' to the right of center and do so more accurately.

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DI can't do it all. The way I ran my H/B SI unit was start in 2D, if something showed up on the screen I'd switch to DI to determine what it was. Then I'd switch to SI to see if it was under the boat or which side it was off to.

Does anyone have a 2D/DI split screen snapshot while sitting still?

If so, please post.

If you only have 20 feet of water then you can narrow it down to only 15 feet from you and you can tell if it is rigrt under you by looking as to where it starts,for instant,if a stump at the bottom of it is at the top of bottom coverage you are right over it but if it starts below the top of bottom then it is that much to one side and if it is way down to the top of bottom it is much to left or right,i agree to others that it is a detail to the 2d and helps give a pic to see what 2d is showing and as for reading from top to bottom it would not be as easy to read for it would look side ways,sounds like you need si or learn your di better

DON, GO TO BED,ITS PASS YOUR BEDTIME:Rofl

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Originally Posted by Don G

Does anyone have a 2D/DI split screen snapshot while sitting still?

If so, please post.

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Here's what DI looks like "sitting still" :

http://i2.photobucket.com/albums/y42...y/DSCF0290.jpg

And if you didn't know better, you might confuse that screen for a 2d rendering, since in either case you're going to get elongated lines across the screen. :Rofl

I'd much rather look down at my screen & see this :

http://i2.photobucket.com/albums/y42...pse791a00c.jpg

... than a multi-colored blob with some boomerangs around it Devil Icon :bash :biggrin


... cp :kewl

I have the Hummingbird 570 di and really like what it shows but then I verticle jig cover.

I don't get those elongated lines, though I don't anchor much. If i do I use 2D, would not think DI would be worth while anchored. I have great results, shell cracker fishing using the 2D to find suspended fish owing in and out of feeding areas.

I think you need a lowrance unit with GPS.
1 run over it
2 click , go to cursor
3 go back, look again, put way point on it
4 be frustrated why you can't catch fish on such a great looking tree

See, now that's what I don't understand about all the love for 2d :dono :Rofl
I mean, I hear people saying they like DI because it helps them interpret what the blobs & blotches are, of the 2d image :yikes WAIT ... SAY WHAT ?? :Doh: If you're using the DI image to tell you what you're seeing on the 2d image .... then what do you need the 2d image for, in the first place ?? :bash
You're going at this backwards IMHO .... :twocents To me, that's like taking a Disney animation film (Down Image) and running it next to a stick figure cartoon (2d) ... just so you know what the stick figure cartoon is supposed to be about, and how it should look.

... cp :kewl

Pappy, this what I like about 2D:: Seeing the fish come up, look, hit, or go back down. I just can't get this kind of image on DI. I missed this one the second time he looked at it.:dono

Attachment 161713

I use 2d about 1% now that I have a good down image. Fish near trees is what Im looking for. Not blobs in blobs

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Originally Posted by Don G

Pappy, this what I like about 2D:: Seeing the fish come up, look, hit, or go back down. I just can't get this kind of image on DI. I missed this one the second time he looked at it.:dono

Attachment 161713

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Maybe if you had been paying more attention to the rod/line, and not watching the DF, you might have caught that fish :Rofl
You do know that there's a little bit of lag time, between seeing the 2d lines move and your reaction time to set the hook (when you're not watching rod or line) ... and that lag time gets a little longer, and our reaction time a little slower, as we get "older" !!

... cp :kewl

thump

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Originally Posted by CrappiePappy

Maybe if you had been paying more attention to the rod/line, and not watching the DF, you might have caught that fish :Rofl
You do know that there's a little bit of lag time, between seeing the 2d lines move and your reaction time to set the hook (when you're not watching rod or line) ... and that lag time gets a little longer, and our reaction time a little slower, as we get "older" !!

... cp :kewl

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It's good to know that your are missing fish!

The 3 sonar technologies (2d/DI/SI)...are just like screwdrivers....

All 3 are "tools" used for the same basic principle....

But each tool is best suited for its own "specific task" at hand...

And none of the 3 can perform that "specific task" as well as the other tool that is best suited for that task...

I wouldn't want to be a electrician going to work with only 1 flat blade screwdriver...

Rickie