To begin trolling, use a new calibration or select a calibration from the Calibration’s list.

Enter the current rod tip height to be used while trolling. This may be different than the height used while calibrating, and the app will adjust.

The Boat Speed field is taken from the Calibration, and is the speed which should be maintained while trolling this rig.

If the GPS switch is turned on, the app will display the actual boat speed, and will show a warning if the current boat speed differs from the calibration’s speed. You may change a setting to determine what percentage speed difference to allow before warning.

Specify the desired depth at which you wish to troll the terminal tackle, by moving the slider widget.

As you change the slider, the graph will change to show the surface of the water, the submerged line, and the unsubmerged line. The depth, surface line angle, and the corresponding total line length value required to reach the desired depth is displayed. The app automatically includes the length of the unsubmerged line, which depends upon the rod height.

Release or recover line so that the line length value is displayed by the line counter of the reel and continue to troll.

The Unsubmerged Line and Submerged Line lengths are also shown as predicted by the app for this configuration at the total line length.

At any time, without additional calibration, you may slide to a new trolling depth, obtain the corresponding total line length, and adjust the fishing line accordingly.