I'll go with this one ...... Looking at the depth number displayed with the fish ID, the numbers are 22,23, and 24 ..... Which would not be below the bottome reading.
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Ok, enough guesses. Let's have the danged answer. [emoji4]
What Evers causing it......please make it stop
Thermoclines can definitely cause some images to seem not what they appear ...
I would surmise in this example ...the bottom is "painted" at the same vertical distance from the xducer in both the 83kHz window and the 200kHz window ...and the estimated vertical distance from us 22.5' depth line would indicate the bottom is "painted" correctly ...
Rickie
I took the bottom left corner of the image and enlarged it so that I could paint stuff on the actual image ...
Attachment 274383
We know the unit should be able to correctly calculate depth (aka distance) to a target because the equation the unit uses to calculate this distance to a target is constant (except for water salinity) ...
So the bottom depth calculation (25.3') and the distance to "Fish ID target" calculations (24') should be correct ...
So it seems my HB 1197 with software version 6.310 "paints" the Fish ID icon below the actual target echo (strong color blotch) ...
What we should learn from this is that if a certain software version does indeed include a "depth label" to a Fish ID icon ... We should trust the "depth label" more than where the Fish ID icon is "painted" in the water column ...
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What I can't figure out is how to turn on "depth labels" to Fish ID icons in my Onix to know how far away fish targets are from the Onix xducer ...
Attachment 274385
Rickie