If you have not disabled the Preferred Line Length setting, the app will automatically fill in the Line Length field, but you can enter your own value if desired.  One measurement should be taken with the terminal tackle only slightly below the surface, but deep enough so that it is running true and undisturbed by the water surface.  Other measurements should be taken with reasonably spaced different line lengths, perhaps 10 or 20 feet apart.

Release or recover the line or change the Line Length field to match the reel’s line counter to the Line Length field, and let the lure stabilize at its depth.

The Trolling Angles software accounts for the unsubmerged portion of the line above water, so always match the Line Length field to the value displayed by the reel’s line counter.

[expandsub4 title=”Determine Line Length without Reel’s Line Counter”]

If you don’t use a line counting reel, a great option is to use a commercially available line counter that is not incorporated with the reel. Alternatively, you may determine the line length by another technique, such as counting reel handle revolutions, counting level-winder traversals, counting manual line pulls, counting line color changes, observing a pre-marked line, or others.

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[expandsub4 title=”Preferred Line Lengths”]

The Measure Line Angles panel will automatically fill the Line Length field according to your Preferred Line Lengths setting. The setting is a comma-separated increasing list of preferred line lengths with up to 1 decimal point precision. At each new measurement, the app will use the smallest preferred length which is greater than all lengths currently in the calibration.
Optionally end the list with a value preceded by a plus sign. The app will increment by this value when all preferred values are smaller than the largest length in the calibration.

If this option is enabled while using the Smartphone Angle Sensor or the Autocline, you do not need to enter any numbers while taking angle measurements. Just deploy the indicated length of line, take the measurement, and press the “Done (Check Mark) button.