737 : Depth reading starts jumping around at 4 feet......

1100, 900, 800 and 700 series Units without Side Imaging
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NorthportTroller
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737 : Depth reading starts jumping around at 4 feet......

Post by NorthportTroller » Sat Mar 13, 2010 12:21 pm

Hey fellas. I just recently installed a 737. It works fine except when the depth gets around 4 or 5 feet or shallower, the depth display starts jumping all over the place showing multiple, random depth numbers. Speed doesn't make a difference or changing the angle of the transducer hasn't helped either. Help? :cry:

NorthportTroller
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Post by NorthportTroller » Mon Mar 15, 2010 5:28 pm

A fella from another site suggested I set the auto gain and auto range to manual, and adjust the range to 10 feet, I will try this on the next boat trip and report my findings. :)

Humminbird_Greg
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Post by Humminbird_Greg » Wed Mar 17, 2010 3:58 pm

Try resetting the menus to the factory settings and than increasing the Surface Clutter menu setting.

If you have another sonar unit on the boat shut it off to see if that helps.
Greg Walters at Humminbird
gwalters@johnsonoutdoors.com
I help because I can

NorthportTroller
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Post by NorthportTroller » Thu Mar 18, 2010 11:32 pm

Humminbird_Greg wrote:Try resetting the menus to the factory settings and than increasing the Surface Clutter menu setting.

If you have another sonar unit on the boat shut it off to see if that helps.
Brotha, I tried that and now the scroll reads good and on pointdown to 2 feet, but the depth number is still jumping around under 4'. You think the way the wiring is bundled with the extra length that was not used is a factor? Should I spread it out more and run it around the boat??? :?

SilmarilS
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Post by SilmarilS » Fri Mar 19, 2010 6:27 pm

I have found that below 10 ft, the settings are very different than 10ft and below.

Where we fish, we must travel on a river 2-5ft deep and I must change all my settings from the deep lake at 60-140ft.

The 2-5ft range is very picky if you want reliable data.

Mine (718) will not measure between 0-3ft, and I find this normal.

0-5 you can see the bottom, so it's a little irrelevant to use sonar data.

This is my personal experience

NorthportTroller
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Post by NorthportTroller » Sat Mar 20, 2010 7:32 am

I guess I'll just deal with it because I can't fix it. I am just shocked that a higher end Humminbird unit would do this. I have had a few of the cheapie fishfinders and they read depth accurately to .5 ft!

StrikeBack
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Post by StrikeBack » Sat Mar 20, 2010 9:43 am

North, just check the Noise setting. The default i on Low. I have found that if I change the setting to Off, the depth reading at shallow depths does tend to become stable.
John

StrikeBack Tackle
Humminbird Dealer
www.strikebacktackle.com.au

NorthportTroller
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Post by NorthportTroller » Mon Mar 22, 2010 7:13 am

StrikeBack wrote:North, just check the Noise setting. The default i on Low. I have found that if I change the setting to Off, the depth reading at shallow depths does tend to become stable.
Alright, next trip I'll turn that off. Any more tips for settings for a river that is 1-13 feet?

NorthportTroller
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Post by NorthportTroller » Thu Mar 25, 2010 8:12 pm

StrikeBack wrote:North, just check the Noise setting. The default i on Low. I have found that if I change the setting to Off, the depth reading at shallow depths does tend to become stable.
I can't find a noise setting, just a surface clutter setting.

StrikeBack
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Post by StrikeBack » Thu Mar 25, 2010 8:16 pm

I assumed there was a noise setting on your unit but maybe not. It will be in the Sonar menu list if it is.
John

StrikeBack Tackle
Humminbird Dealer
www.strikebacktackle.com.au

NorthportTroller
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Post by NorthportTroller » Thu Mar 25, 2010 8:17 pm

NorthportTroller wrote:
StrikeBack wrote:North, just check the Noise setting. The default i on Low. I have found that if I change the setting to Off, the depth reading at shallow depths does tend to become stable.
I can't find a noise setting, just a surface clutter setting.
Oh, I found it, it's under the advanced user mode. Ok, I'll test that out. I am on the river right now. I will report back. Thank you bud. :D

StrikeBack
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Post by StrikeBack » Thu Mar 25, 2010 8:22 pm

Great, look forward to the result. Amazing I am thousands of miles away in my lounge room and you in a boat on the river communicating!
John

StrikeBack Tackle
Humminbird Dealer
www.strikebacktackle.com.au

NorthportTroller
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Post by NorthportTroller » Sun Mar 28, 2010 8:31 am

StrikeBack wrote:Great, look forward to the result. Amazing I am thousands of miles away in my lounge room and you in a boat on the river communicating!
That is nut's, your'e like, upside down compared to me, haha. Think of that whole planet in between our feet. I adjusted that settting to off, and it made some diffrence. Do you have any other tips for my settings for this river buddy? Thanks.

Here's a little video of who I am and what the boat looks like buddy, enjoy...




http://www.youtube.com/watch?v=SteNPL0TsZ4

bogieman
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Post by bogieman » Tue Apr 06, 2010 7:27 pm

I have the same issue with a brand new 788ci. Really annoying on a unit that cost this much. My brothers $99 garmin 140 reads perfectly. I also thought the GPS would read accurate at trolling speeds but it varies from .8 to 2.0 mph.

Humminbird_Greg
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Post by Humminbird_Greg » Fri Apr 09, 2010 12:47 pm

Check the software versions in your units.
Try resetting the menus to the factory defaults and than set the Water Type to the Deep (salt) setting and turn the Surface Clutter up to a setting of 9.

The GPS derived speed can vary by that much or more based on how accurate of a position fix it has. Where is the GPS Receiver located and what type of Fix Type, HDOP and Estimated Position Error is the 788ci showing?
Greg Walters at Humminbird
gwalters@johnsonoutdoors.com
I help because I can

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