It's important to mark structure in the SI image by placing the waypoint at the point where the structure seems to touch the bottom ...

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Then reposition the boat and approach the waypoint watching 2d ...

If the structure does not come into the 2d image = immediately switch back to SI to see which side of the boat the structure passed by ...

Readjust- reposition- and repeat ...

Once the structure is definitely located - drop another waypoint on the correct spot and delete the initial waypoint ...

Rickie