Thread: Humminbird New Features for 2011

Originally Posted by Humminbird_Greg

Building???
That’s a submerged swimming pool guys! Look on the bottom right side of it and you can see the steps in the shallow end of the pool. Know this pool well as it was a part of the Cotton Growers Association’s Club before the lake was backed up.

Those Range Lines are just that: the range (or distance) from the transducer. These are spaced an equal distance from each other just like they are in the 2D sonar.

rescue.tech was close in saying that there are two different distances as there are really three: water depth (directly under the transducer), distance horizontally across the surface of the water, and the one he missed: distance from the transducer (also known as “slant range”). Of these we can only show the first (water depth under the transducer) and last (slant range). The horizontal distance could be calculated but it would only be accurate if the bottom were perfectly flat.
What you stated: “Or maybe I am totally wrong and the building is 75 feet from the boat at a direct line from the boat at an angle” is true. With the Contour mode On or Off, the pool is still a distance of about 75 feet from the transducer.

When you remove the water column area and the Si Range stays the same, than the distance being displayed would be less than with the water column showing and therefore all of the structure would appear to be stretched horizontally. No SWAG just the fact that you are using the same number of pixels to show a smaller distance is all.

Thanks for the clarification Greg. So it's Depth + Horizontal (from directly under the boat on the bottom, out to the object) = A straight line measurement in an arc from the transducer to the object in question.