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Max Online: 36273 @ 01/23/13 02:34 PM
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#12715061 - 04/13/18 11:36 AM Another Humminbird question
Blue Blazer 2400 Offline
Extreme Angler

Registered: 02/23/05
Posts: 1409
Loc: Royse City, Tx
I have a Helix 12 Mega. When in 2D I am getting a double bottom read in shallower water (15' and less). I have had this on other units and it wasn't a big deal because the false bottom was always showing up below the real bottom. But on this unit it is opposite. What I mean is lets say I am in 15' then the second reading is showing up about 7' and I can't read anything on the 2D screen.

Any ideas? Does this have to do with Chirp?

I will try to remember to take a pic next time I am out

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#12715158 - 04/13/18 12:19 PM Re: Another Humminbird question [Re: Blue Blazer 2400]
44 Diesel Online   content
TFF Celebrity

Registered: 12/25/12
Posts: 5268
Loc: Burleson,TX
Double bottom readings can usually indicate hard bottom. But there are some issues with bird units doing this.

Set switchfire to clear mode

Turn down sensitivity in shallow water

May need to set depth manually to about 5-10' deeper than actual bottom reading.

Turning off chirp may help also in shallow water

You can also try adjusting the surface clutter as well

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#12716712 - 04/14/18 02:47 PM Re: Another Humminbird question [Re: Blue Blazer 2400]
Capt Craig Offline
Extreme Angler

Registered: 08/25/09
Posts: 1627
Loc: Richland-Chambers
I hear about the double bottoms showing up a lot. However, it is most common when you are using 200 kHz freq. If your CHIRP is on, and your freq reads HIGH, switch it to MEDIUM. MEDIUM or MEDIUM/HIGH should be the correct setting.
_________________________
Capt. Craig Copeland
Licensed by the US Coast Guard

2013 Nautic Star 2110 Shallow Bay Boat
Humminbird HELIX 12 CHIRP MEGA SI GPS G2N
Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)

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#12719124 - 04/16/18 05:54 PM Re: Another Humminbird question [Re: Capt Craig]
Wayne P. Online   content
TFF Team Angler

Registered: 11/16/10
Posts: 4137
Loc: Charlottesville, Va
Originally Posted By: Capt Craig
I hear about the double bottoms showing up a lot. However, it is most common when you are using 200 kHz freq. If your CHIRP is on, and your freq reads HIGH, switch it to MEDIUM. MEDIUM or MEDIUM/HIGH should be the correct setting.


With a Helix, the unit is broadcasting 200 kHz (high CHIRP) whether you choose to view it or not. It is used for the Depth readout.
83 kHz (med CHIRP) is turned on when you choose to view 83 kHz or 83/200 kHz.
_________________________
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1

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