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997 update

Mark Morris's picture

By Mark Morris - Posted on 11 February 2011

ray, i installed the new update on my 997 yesterday. not sure what all the enhancements were but, on the si screen for enhancements it added contour off and on. it makes a major change in what you see but i am not sure what i am seeing. i was not on the water only on simulate. can you help me out. m

Ray's picture

I will make a new post on the front page that shows what this feature is and what it does because I can not post pictures in a comment. I think I can clear it up for you though.


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A distinct layer of water where rising warm and sinking cold water meet but do not mix. It is a layer of water where the temperature changes at least one-half a degree per foot of depth. In many of our desert bass lakes, a thermocline often develops during the spring and breaks down in the fall. The colder layer of water is often lacking in oxygen, forcing most baitfish and sport-fish to the upper layer of water. Thermoclines can be so dense that they actually show up on sonar (fish finders and depth finders) as a thick, impenetrable line.

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