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Hey everyone I am trying to learn how to use my side imaging on my hb798 and I am curious to know everyone's settings in the side imaging display.... I know I am on stuff but I can never see anything on my unit. I know I new to adjust the settings but I still need help on where to go
I keep my SI Range set to 60-70 ft left AND right.. (unless I want to discern a piece of structure.. I may set to left OR right.. This, in effect zooms that side's image)...
I keep the "SI Enhance" window up on my screen anytime I am viewing SI...
This gives the abilitiy to change "SI Sensitivity" setting without (opaquing out) any other split view that I have up at the time...
I use the SI Sensitivity setting as a "brightness" control for my SI image (as different water conditions/bottom compositions will make the image brighter/darker..)
SI Sensitivity up will brighten the image...
SI Sensitivity down will darken the image...
I frequently change this SI Sensitivity setting as my SI image changes in brightness...
Here is a screenshot of the "SI Enhance" window overlayed onto the SI image... I had to adjust the sensitivity to 19 to get this mud bottom to reflect enough sonar echo to get an acceptable image...
http://i477.photobucket.com/albums/r...c/020c59aa.jpg
I set the contrast to 10-12...
I set the sharpness to off..(raising the sharpness will make the fish "pop out" on the screen but makes the image grainy..)
I set the chart speed to match boat speed...1mph=1 chart setting, 2mph = 2 chart setting, etc...
Rickie
You might consider buying the HDSI xducer to use with your 798....
XHS 9 HDSI 180 T :: Humminbird
Some say the 455kHz frequency in this xducer gives better images than the stock compact SI xducer that comes with the 798..(you will not be able to use the 800kHz frequency in the HDSI xducer because the 798 does not have circuitry to read the 800kHz data...)
Rickie
Ricky, in your pictures from the first post I can see how the brush pile looks in your 2d and in your down imaging but I couldn't see it in the side imaging, where actually is it located?
http://i477.photobucket.com/albums/r...c/020c59aa.jpgQuote:
Originally Posted by bowhunter1
The brushpile in the SI image is at the very top ..it just entered the screen when I took the screenshot...
I was directly over the brush.. So the brushpile actually shows as the "Bump" in the left and right water column...
This is an "un-talked-about" image size phenomenon in SI discussions...
Structure image ratio size ...SI vs 2d
In my 1197:
A brushpile that shows as the size of a golfball on the 2d screen...shows as the size of a quarter in the SI image...
Structure images are roughly 1/4 size in SI as to what you are used to seeing in 2d...And if you "split" the screen... Structure images are smaller still...
This is why it is stressed to buy the biggest screen one can afford...structure in SI images are very small compared to the same structure in 2d or DI...
It's part of the SI image interpretation learning curve to realize how big (actually how small) structure actually looks in an SI image...
I think this is one of the most difficult aspects to learn in SI image interpretation...
One would see the brushpile in 2d or DI and then expect to see that same ratio sized brushpile in SI ...
Not so...the same brushpile in SI is 1/4 the size....(at a Normal SI Range setting of 60-70ft left and right)..
There are 2 ways to make the brushpile image physically bigger in the SI image..
1. Lower the SI Range setting...(less bottom coverage = more pixels per square foot of lake bottom)
2. Set SI side setting to 1 side only...(same reason as above)..
It takes practice to train one's eyes to recognize the image size ratio difference of structure in SI vs 2d or DI... But once it clicks in your head...(1/4 size in SI)... Brushpiles will "jump" out on the SI image for you..
Rickie
http://i477.photobucket.com/albums/r...c/020c59aa.jpg
Did anyone even notice the pallet in the lower right of the SI image...??
Pretty small huh...??
And that's on 10.4 inch screen...!!
Remember...structure in SI is roughly 1/4 size of what you think it should show up as...
Rickie
Thanks for the help. I spent a hour or so on the lake today piddling around tryin to get it to work and I couldn't find or see anything
One of the best tools in these units is the recording feature...Quote:
Originally Posted by bowhunter1
Set up along a bank ..trolling parallel to the shore...
Set the unit to one side only at about 50 ft SI Range...
Record the entire shore for about 30 minutes...
Take the recording home and study it on the HB unit and in Humviewer....
SI image interpretation takes some getting used to..
Also take snapshots and post them here where we can help interpret...
Rickie
What lake are you on bowhunter?
Lake shelbyville in illinois
I'm a couple hours north of you (up by Peoria) but I'm sure if you went on the Illinois board and asked for someone there to do a ride-along with you, you would get some offers. There are multiple folks in your area using that same unit and more than likely you'll get plenty of help. Heck, I'd be willing to come down that way and go for a ride with you if you didn't mind waiting a couple of weeks. Got to go to New Orleans next weekend for the NCAA semi finals and the championship game. I have 2 HB 898's but they can't be that different. It would give me an excuse to pull the boat down that way and try Shelbyville again.Quote:
Originally Posted by bowhunter1
Kennedy, Thanks for the advice, I might have to take u up on the offer sometime but it wouldn't be for a few weeks cause of work and then I am off to Grenada in two weeks.... We will see what happens
So when I try to go to my 455 kHz setting all that shows up in the beam select column is 200/83, 200, and 83khz settings.... When I go to transducer select and select quad beam(. I normally have it in compact sidescan). It doesn't allow me to view the side imaging screen but it brings up the 455khz sensitivity setting in my sonar choices... I'm stumped on this because I am using a xtm 9 hdsi 180 t transducer and it even says on the box that it allows for 200/83/455/800khz. What am I doing wrong?
The 798 does not have the internal circuitry to read the SI data for the 800kHz sonar beam so there is probably not a setting in the 798 menu to even select 455kHz...
When the xducer select is put to "Quadrabeam" the unit thinks you have a quadrabeam xducer attached so it looks for 455kHz oval shaped sonar beams in this depiction (even tho the "quadrabeam 455kHz oval shaped sonar beam" and a SI 455kHz fan shaped sonar beam are 2 completely different technologies)...
Basically this means 2 different sonar beams can have the same frequency (455) but still be 2 different technologies when it comes to what the processor needs to display data from that xducer crystal (or crystals)..
The 455kHz SI sonar beam is not the same as the Quadrabeam 455kHz sonar beam...
http://i477.photobucket.com/albums/r..._sideimage.jpg
Clear as mud?
Rickie
So I'd need to keep it set at compact sidesan and 200/83khz setting?
The first section in this depiction is the SI 455kHz sonar beam and you can see how its shape differs from the Quadrabeam 455kHz sonar beam in the previous post...
http://i477.photobucket.com/albums/r...inc/unjpeg.jpg
Rickie
I have seen that diagram before... But my understanding. Is now that I only have 3 choices of sonar type to choose from... Is that normal for my unit and what would be the best one
The 200/83 2d sonar beam setting is a "blend" of the 200kHz 20degree cone shaped sonar beam AND the 83kHz 60degree cone shaped sonar beam...Quote:
Originally Posted by bowhunter1
This will give the best results in your 2d sonar views...
Because the 798 cannot read the 800kHz SI data from the xducer.. When the unit is showing any SI view- it is the 455kHz SI fan shaped sonar beam....
Rickie
The only instance I would ever select 200 OR 83 is if I wanted to pinpoint a piece of structure to be in the 200kHz 20 degree cone ... If the setting is at 200 and a brushpile shows on the screen.. You can be certain that brushpile in nearly "directly" under the xducer..:
A 20 degree cone is a very small cone...(something like 1/3 of your depth)..
Rickie
So my best bet is to use the 83 since it is the widest range ?
I leave mine on 200/83 most of the time...Quote:
Originally Posted by bowhunter1
This will give you the widest range for picking up fish in the outer reaches of the 83kHz 60degree cone ..
And give the best detail of structure in the 200kHz 20degree cone...
Also to make the structure really "pop out" on the 2d sonar view... Set Switchfire to "Max mode" and then adjust sensitivity to a level that shows some surface clutter but not too high to cause extra clutter in the water column...( I generally run my sensitivity up until some widely scattered dots (clutter) start showing up in the water column)...
Rickie
Rickie thanks for your help.!
Another thing that I learned from a HB rep at a seminar is you can lower the sens setting if you set the contrast at a lower setting. I am currently trying this.
This is a pic from my 798SI
Attachment 109773
Very Nice!Quote:
Originally Posted by probucktails
Probucktails... The SI image shows where you had just crossed a small ditch or creek...Quote:
Originally Posted by probucktails
Was the water depth to the left sloping down away from you creating the darker left side of the image...??
Rickie
yes, to the left of theimage that you can't see is a drop off to the river channel all the way down this bank, i was actually quartering towards the river channel going from shallow to deeper at an angle. if i had the si set to a wider angle you would see complete black where the river channel is. the black would be ther because the si beam runs right off the top of the ledge and can't get what is deeper than the ledge. iv'e got alot more pictures of crappie on stake beds and brush that i'm going to post when i get time. thanks for the compliments. by the way, the ditch is a creek channel that runs into the river channel
Here are a few more pictures from my SI unit, all are crappie relating to different structure or cover. I put a description on one to help you understand what your looking at. All The white dots are Crappie's!!!!! The SI unit i got is worth more than any rod, reel, lure, in the boat, it's amazing how well it works in finding fish, seeing where their positioned etc, worth it's weight in gold. I couldn't really afford it when i got it but i had sold many muskie bucktails(which i make) and my good old jeep cherokee, bit the bullet and bought one. if i had to do it again, i would sell every rod, reel, lure(except for one rod/reel and crappie tubesof course) and do it again. very effective
Attachment 109837Attachment 109838Attachment 109839
This is good info for those who might wonder why 1 side of their SI image "could be" considerably darker than the other....Quote:
Originally Posted by probucktails
Rickie
probucktail, niece pic's, Ihave followered a underwater rail road bed without going off to one side or the other by watching which side started changing color,darker side ,deeper water ,lighter side showed that side was going up hill.
great help!