Author Topic: Change in scanning color???  (Read 2960 times)

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Offline basszilla

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Change in scanning color???
« on: April 01, 2012, 10:00:59 PM »
Question:  Why does my unit change to a darker color by itself without moving settings.  In the pics I am at 24 feet were the road bed is.  Then the break drops to about 28 feet, but the color of the scanning becomes darker.  The darker scanning continues.  I under stand that the unit does the darker shading to tell the user that there is a change in depth.  I have pictures of scans were I am 30 plus feet with breaks and the unit will not have the change of color.  This has also happen during shallow scanning.  Any suggestions???  Thanks in advance...


Offline calli1

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Re: Change in scanning color???
« Reply #1 on: April 01, 2012, 10:55:47 PM »
From what I am seeing is the change in contour of the bottom of the lake.  If the bottom colors get brighter all of a sudden then that means a possible harder bottom as well as a humpr or shallower waters.  When the colors fade to lighter...then I would say a gradual decline in the bottom where the water is getting deeper.  When this happen the beam can't scan the bottom as well but on a sudden rise in the scan zone...the bottom will appear a much brighter color. 

Offline lcookie

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Re: Change in scanning color???
« Reply #2 on: April 02, 2012, 01:44:26 PM »
Most likely it is due to a change in bottom hardness since your depth did not change that much.  Soft bottom equals darker returns.

Offline Humminbird_Greg

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Re: Change in scanning color???
« Reply #3 on: April 03, 2012, 05:21:08 PM »
When the color of the Si sonar returns turn darker; it is an indication that whatever the bottom of the lake/river is made of, it reflects less sonar energy back to the transducer.  This normally means a software material (say from rock to mud) but it could also mean that the surface of the bottom is angled away from the transducer.

Greg Walters at Humminbird
gwalters@johnsonoutdoors.com

Offline sonar2000

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Re: Change in scanning color???
« Reply #4 on: April 03, 2012, 05:24:53 PM »
HB has a good write up on sonar returns in the book or disk. It is also available in the web site.
It explains the returns real well..

Chuck


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