Author Topic: New 999 unit depth reading error; graph vs dig reading  (Read 3900 times)

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Offline fishbone

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New 999 unit depth reading error; graph vs dig reading
« on: October 08, 2015, 09:04:21 AM »
Had my 999 SI HD out for the first time and saw some goofy readings on depth.
One example was in 8' of water where the scrolling graph read 8' correctly while the digital desplay (block on the left side) read 18'.
Most areas it was correct, but under 8' the digital was unreliable.
Any ideas?

Also, when I pressed the "mark" button, a saved message would pop up, but the chart was never actually marked. I may have something not 'set' or enabled. Not sure.

Thanks.

Sorry, I posted in the wrong spot and can't move it.
« Last Edit: October 08, 2015, 09:17:12 AM by fishbone »
2013 Stratos 189 VLO
E-Tec 150 HO 150hp, 6" JP
80# Fortrex, 2ea 8' Power Poles
HB 998cSI @ Console, HB 999HD SI @ Bow


Offline rnvinc

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  • Joined: Nov 2009
  • Location: Western KY
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  • Unit(s): 1197c SI Combo, Onix 8ci SI Combo
  • Software: Dependent on whim
  • Accessories: AS GRHA, AS GPS HS, LowBird LSS 1 & 2
Re: New 999 unit depth reading error; graph vs dig reading
« Reply #1 on: October 08, 2015, 09:36:10 PM »
Shallow water over hard bottoms sometimes creates these type of issues ...

You can try Switchfire Clear under the Sonar tab and maybe turn down Sensitivity just a little ...
-----
-----
If Screenshots is Enabled under the Accessories tab and there is no SD Card in the unit ... The unit will err on actually creating a waypoint ...

Either insert a SD Card or Disable Screenshots under the Accessories tab ...

Rickie

Offline fishbone

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Re: New 999 unit depth reading error; graph vs dig reading
« Reply #2 on: October 09, 2015, 07:18:12 AM »
The worse offending area did have a rocky bottom. Seemed strange one readout would be effected, but not another.
You are right again, I had no SD card in the unit. I'll correct that.
Thanks for the help.
2013 Stratos 189 VLO
E-Tec 150 HO 150hp, 6" JP
80# Fortrex, 2ea 8' Power Poles
HB 998cSI @ Console, HB 999HD SI @ Bow

Offline rnvinc

  • Hero Member
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  • Joined: Nov 2009
  • Location: Western KY
  • Posts: 3714
  • Unit(s): 1197c SI Combo, Onix 8ci SI Combo
  • Software: Dependent on whim
  • Accessories: AS GRHA, AS GPS HS, LowBird LSS 1 & 2
Re: New 999 unit depth reading error; graph vs dig reading
« Reply #3 on: October 09, 2015, 02:43:32 PM »
The worse offending area did have a rocky bottom. Seemed strange one readout would be effected, but not another.
You are right again, I had no SD card in the unit. I'll correct that.
Thanks for the help.

Hard bottoms can allow the sound pulse to bounce more than once ... bottom reflection - surface reflection - back to bottom reflection - then to xducer ...("double echo" ...and sometimes "triple echo") ...

This sometimes confuses the unit as to which reflection the "actual bottom" really is ...

Switchfire Clear and reduced Sensitivity seems to be the best "workaround" for this specific scenario ...

Rickie
« Last Edit: October 09, 2015, 02:46:19 PM by rnvinc »

Offline fishbone

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  • Posts: 32
Re: New 999 unit depth reading error; graph vs dig reading
« Reply #4 on: October 25, 2015, 11:07:48 AM »


You can try Switchfire Clear under the Sonar tab and maybe turn down Sensitivity just a little ...
-----

[/quote]

It was already on Switchfire Clear. Which, or where, is the sensitivity that I can adjust down? Thanks
2013 Stratos 189 VLO
E-Tec 150 HO 150hp, 6" JP
80# Fortrex, 2ea 8' Power Poles
HB 998cSI @ Console, HB 999HD SI @ Bow


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