Humminbird 998 C SI depth problems

Tried out my new 998c si today and am having problems with the depth readout and the water column in DI and 2D sonar. The depth reading will read right for a few seconds and then jump all over the place. The DI and 2D sonar are reading right for a few seconds and then the water column will go to 0. The SI seems to be working O.K., just the DI and 2D. The depth readout and water coumn jumping around don't happen at the same time if this makes any sense. My transducer is mounted on the jackplate and this happens at anywhere from 2 to 6 mph.
If anyone has any ideas that might help I would really appreciate it. If not I will call Humminbird in the morning.
Thanks,

bigminner :confused:

My question is if you are sitting still does it read ok then. If so it may be turbulence.

I did'nt think to check it sitting still, "DUH". If it is turbulence would it not affect SI also?
The transducer is appx. 2" below and 3" back from a step on the transom, and there is another step below that. It looks like it would be hard to find a place on the transom to mount it. I really can't mount if any further back on the jack plate.
I am going to go back out today and check it again.
Thanks,

bigminner

Check the software version currently installed in your unit....

I think versions 4.750 and earlier had shallow water depth reading problem..

This was supposedly fixed in 4.950 (someone correct my numbers if I'm incorrect)

Rickie

Let us know what your menu settings are if they are not on the factory default setting.
Also make sure that you did not have a second (or third or fourth…) sonar unit on as this could be sonar-to-sonar interference causing this.

"Problem solved", I must have had a whole flock of senior moments yesterday as I never thought of the obvious. I have an older Stratos with an in-dash "flasher" that has a through the hull transducer. I am using it for high speed running. It was causing interference, which was messing up the depth readout as well as the DI and 2D sonar.
Everything seems to be working O.K. now, I just need to learn how to fine tune it and use it.
Thanks for the replys,

bigminner

bigminner,
Try running your indash flasher again but set the Noise Filter menu on your 998c Si unit to a higher setting to see if you can get them to ‘play nice’ together. This does not always work but it may this time...

Will try, thanks

greg,
my 2nd day in the water with my new 898c si. i have depth readings all over the place, no mater what the depth. i also see no fish symbols although its on and the fish are there. i am not happy that i can not find a dedicated screen to di or a dedicated screen to si. just combos whats with that? or have i missed something?

Crappiegirl, check your view selection menu and see if your single screen views have been selected as hidden.

I run a 798ci up front of my boat. When I first started out had a 785c2i up there too. I wanted to use one to follow creek channels and one for SI. The never did play well together and had to seperate them. I tried software updates but the fight was still on. Good luck.

did that and no single views not hidden dont see at all

that problem solved with the views, but no fish symbols although turned on, depth readings all over the place although ive done the update, will continue in a new thread the problems that i am having and spending evry day on the phone with customer support. i am over it----taking it back

and furtherm ore---whats gregs problem, i have addressed questions to him directly with no answer---is it a woman thing?

Same thing with mine, updated to new software version, problem solved.

Crappiegirl check your unit and write down the software version number then check humminbird website and verify they are the same. If not redownload on a formatted sd card and try again. I have 2 997's and they have been easy to update and run my buddy has a 898 if need be pm me and ill try and help u figure it out. Check the "faq's" on humminbird also for similiar issues from others.Hope this helps

Sent from my SPH-D700

i have registered my unit, the software download is the appropriate one, i have been to all the forums to now avail.

i have started a new thread, help with 898c si or throwing in the lake--its a good read

Also make sure that you don’t have another sonar unit on at the same time as well. In fact it may just be easier to reset all of the menus back to the factory default menu settings by using the Restore Defaults menu which is under the Setup menus.

did that before i took it back to bps

Quote:

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Originally Posted by Crappiegirl1

and furtherm ore---whats gregs problem, i have addressed questions to him directly with no answer---is it a woman thing?

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Sorry Crappiegirl1 but I don’t have a problem answering posts or messages from Women. I have a normal job here at Humminbird that does not always allow me on the various posting boards to help answer questions and troubleshoot problems with Humminbird units. In fact I don’t think I’ve been on this board between about the 10th of this month until the 22nd which was too late to help you. I’m only able to get on this week as I have had some time between training classes (I’ve got someone taking a test as I type this!).

For what its worth: I believe that you did get someone else’s returned unit from what all I have read.