Strukturescan - HDS - how to set up in shallow water?

[gregkrak]

Hi, I swim in the water with a depth of 10 meters and I asked how to set parameters:
- Contrast
- Frequency
- Surface Clarity
- And other

Please write to set the parameters as well to really show structurescan + HDS-8.
The same problem I have with an ordinary transmitter HST-WSBL (106-72), I do not see fish arches - please, help in setting functions assuming that swim in shallow water to 10 meters.
Thank you in advance for your help!