Author Topic: Incorrect depth reading  (Read 6092 times)

0 Members and 1 Guest are viewing this topic.

Offline chadwick0139

  • Newbie
  • *
  • Joined: Mar 2014
  • Location: Hendersonville, TN
  • Posts: 5
  • Unit(s): 998c SI, 788ci
Incorrect depth reading
« on: June 16, 2014, 03:05:09 PM »
Sorry if this has been discussed, but I have started to get incorrect depth reading from the sonar view.  It will go in and out so it's not always incorrect.  If I look at the sonar view it will pick up two bottoms, but it will take the depth reading off the second bottom.  Say I'm in 7 fow, there will be a bottom line at 7' and the second return line will be at 15 fow, but the depth will read 15 fow instead of 7 fow.  If I look at the DI it clearly looks like I'm in 7 fow but reads 15 or whatever depth that might be.   

Anyone else had this problem?  It only happens in shallow water and it wouldn't be a big deal but I purchased autochart and my maps are incorrect because it will randomly show a quick drop off.  Any help would be great.

P.S.  This started before the last update. 


Offline Humminbird_Greg

  • Humminbird Helper
  • Humminbird Staff
  • *
  • Joined: Mar 2009
  • Location: Eufaula, AL.
  • Posts: 6546
  • I help because I can
    • Humminbird Web Site
Re: Incorrect depth reading
« Reply #1 on: June 17, 2014, 08:52:23 AM »
chadwick0139,
Try adjusting the Surface Clutter menu on your unit and also make sure that you other sonar unit(s) are not on when this happens.  You may also want to try setting the Water Type menu to the Saltwater (deep) menu setting.  Let us know if that helps or not.
Greg Walters at Humminbird
gwalters@johnsonoutdoors.com

Offline chadwick0139

  • Newbie
  • *
  • Joined: Mar 2014
  • Location: Hendersonville, TN
  • Posts: 5
  • Unit(s): 998c SI, 788ci
Re: Incorrect depth reading
« Reply #2 on: June 17, 2014, 08:56:11 AM »
chadwick0139,
Try adjusting the Surface Clutter menu on your unit and also make sure that you other sonar unit(s) are not on when this happens.  You may also want to try setting the Water Type menu to the Saltwater (deep) menu setting.  Let us know if that helps or not.

Should I turn the surface clutter up?  There are no other sonars on.

It only happens in shallow (<10') water. 

Offline Humminbird_Greg

  • Humminbird Helper
  • Humminbird Staff
  • *
  • Joined: Mar 2009
  • Location: Eufaula, AL.
  • Posts: 6546
  • I help because I can
    • Humminbird Web Site
Re: Incorrect depth reading
« Reply #3 on: June 17, 2014, 09:45:10 AM »
Normally turning the Surface Clutter to a lower number helps.
Some have to turn it down to a setting or "1".
If this helps, you may want to check it later on in the year because this may be getting tripped off by an algae bloom or some type of plankton/zooplankton or even wind/waves and/or rain that all add to the surface clutter.  What i am trying to say is that the amount of Surface Clutter on a particular body of water can change throughout the year, so you may be able to set the Surface Clutter menu to a different setting later on.
Greg Walters at Humminbird
gwalters@johnsonoutdoors.com

Offline chadwick0139

  • Newbie
  • *
  • Joined: Mar 2014
  • Location: Hendersonville, TN
  • Posts: 5
  • Unit(s): 998c SI, 788ci
Re: Incorrect depth reading
« Reply #4 on: June 17, 2014, 09:49:15 AM »
Normally turning the Surface Clutter to a lower number helps.
Some have to turn it down to a setting or "1".
If this helps, you may want to check it later on in the year because this may be getting tripped off by an algae bloom or some type of plankton/zooplankton or even wind/waves and/or rain that all add to the surface clutter.  What i am trying to say is that the amount of Surface Clutter on a particular body of water can change throughout the year, so you may be able to set the Surface Clutter menu to a different setting later on.

Ok.  I always have the surface clutter set to 1.  I get 2 returns all the time but the unit should know that the top return is the bottom not the 2nd return.

Offline Humminbird_Greg

  • Humminbird Helper
  • Humminbird Staff
  • *
  • Joined: Mar 2009
  • Location: Eufaula, AL.
  • Posts: 6546
  • I help because I can
    • Humminbird Web Site
Re: Incorrect depth reading
« Reply #5 on: June 17, 2014, 10:26:57 AM »
It should but they can be fooled and confused sometimes and some of the menu setting will help.  Try the Saltwater (deep) menu setting on your next trip to see if that helps or not.
Greg Walters at Humminbird
gwalters@johnsonoutdoors.com

Offline h8go4s

  • Jr. Member
  • **
  • Joined: Mar 2010
  • Location: Minnesota
  • Posts: 22
  • Unit(s): 898C SI
Re: Incorrect depth reading
« Reply #6 on: June 18, 2014, 10:42:56 PM »
You might need to reduce your sonar sensitivity in shallow water.

Offline bobcoy

  • Sr. Member
  • ****
  • Joined: Sep 2011
  • Location: arkansas
  • Posts: 286
  • Unit(s): 1197 & 1198
  • Software: 6.640 & 7.670
  • Accessories: iPilot-Link,GRHA GPS-HS,ETH 5PS
Re: Incorrect depth reading
« Reply #7 on: June 19, 2014, 02:21:49 PM »
I have seen recommendations to put the switchfire to clear under 10' of water.


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo

 

Related Topics

  Subject / Started by Replies Last post
2 Replies
12287 Views
Last post June 11, 2010, 08:42:41 PM
by majflyboy
13 Replies
12043 Views
Last post March 27, 2011, 03:46:51 PM
by KickSomeBass
4 Replies
8249 Views
Last post April 11, 2012, 08:49:42 AM
by sonar2000
6 Replies
6148 Views
Last post October 31, 2012, 03:42:56 PM
by Humminbird_Greg
16 Replies
11486 Views
Last post May 29, 2014, 08:41:20 AM
by Humminbird_Greg
6 Replies
6729 Views
Last post October 25, 2014, 02:56:14 PM
by DiveExplorer
4 Replies
12142 Views
Last post October 25, 2015, 11:07:48 AM
by fishbone
4 Replies
4201 Views
Last post July 19, 2017, 07:40:30 PM
by tschultz


SimplePortal 2.3.3 © 2008-2010, SimplePortal