No, it is not. However, it is different than many other trolling depth charts you may have seen.

Some other graphs show the water surface as 0 on the y-axis (up/down), with the depth shown as a negative number (down) and the length of the line on the x-axis to the right. This simple xy orientation lets you read across the graph to find line length vs depth, and is ok for a static, non-interactive graph or numerical chart.

The Trolling Angles graph shows the lure at 0,0, the water surface is shown as y feet above the lure, and the x axis shows horizontal distance, not the line length. Line Length is shown along the arc of the line’s curve.

This chart has several advantages and features.

• The graph shows the exact profile of the trolling line’s geometry, with a 1:1 aspect ratio.
• The potential line curve for the rig is shown as a gray line. This line does not change as the depth slider is moved. Trolling Angles is premised on the fact that the submerged line geometry does not change as the line is deployed deeper.
• The chart shows the unsubmerged line from the rod tip to the water surface as a straight magenta line. A traditional static chart cannot easily account for unsubmerged line.
• The graph is capable of easily showing multiple different rigs, or at different speeds on the same chart, in an obvious way.

• The graph is designed to give you an intuitive unbiased understanding of line curve geometry and of the capability of the rig. But, it is really just a visual eye-candy aid. It is not intended to be used like a static chart to directly find depth versus length. The numerical information of the Depth Control does that as the slider is moved interactively.