Humminbird Side Imaging Forums
Side Imaging Forums => 898c SI => Topic started by: basszilla 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...
-
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.
-
Most likely it is due to a change in bottom hardness since your depth did not change that much. Soft bottom equals darker returns.
-
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.
-
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