Topic: Will SI Do This?

[wldrns1]

Lets say I'm in 100' of water...Finger Lakes in NY. Water is quite clear. I'd like to use SI to see fish off to the sides of the boat at the top of the thermocline or higher. Thinking I need to set a maximum depth/top of thermocline (say 60') once established with DI. Understood screen would show no bottom. Fish would show as points of light. I've tried this but not sure I set it up correctly. Sorry, don't recall settings. Possible? Suggestions including settings to try?

[rnvinc]

The challenge with this scenario is that a fish at 60ft straight down and a fish at 60ft to side are going to show in the SI image at the same point in the image  ...

It’s the additional shadow cast against the bottom detail that helps one’s interpretation of where each fish is in the water column  ...



So, if you set the SI distance at 60ft in a water depth of 100ft - all you will know is that there is a fish at 60ft away from the xducer “somewhere” in that radius semi circle shown in the diagram  ...

The other challenge with your specific scenario is that if you extend the SI distance out far enough to get any lake bottom showing on the screen (to hopefully cast a fish shadow) - that fish target is going to be so small in the image it may be missed  ...

This can be mitigated somewhat by setting the SI image to one side only (which will zoom the entire image)  ...

Deep water SI is definitely challenging to target fish  ...

Rickie

[wldrns1]

New here. Thanks for a the very concise answer. Nice diagrams!

Would using Cursor/Mark/GoTo identify where a particular target is and get me there? Same scenario as original Post. Open water. No bottom.

[rnvinc]

New here. Thanks for a the very concise answer. Nice diagrams!

Would using Cursor/Mark/GoTo identify where a particular target is and get me there? Same scenario as original Post. Open water. No bottom.

Not accurately  ...

A waypoint created on the SI image with the active cursor is calculating that waypoint’s latitude/longitude position (on the Earth) in relation to where the cursor is over the lake bottom … not where a target is in the water column  ...

Rickie