The Base activity focuses on a single calibration and is invoked by the Start button of Main screen or by picking a calibration from the Calibration List.

Calibration Persistent Data

The calibration data, comprising the multiple length and angle pairs, the angler-defined name and attributes, the boat speed, and rod tip height of the rig is stored in persistent storage so that it can later be retrieved and reused in another subsequent trolling session without the need to recalibrate.

All changes to a calibration are captured immediately after updating the values, but the the calibration database is updated only when you leave the base screen back to the Main screen or Calibration List.

Base Activity Screen

The Base Activity is a multi-part screen which consists of several tabbed full screen panels.

Top Toolbar

The top toolbar has

• Back (arrow) button, which reverts to the previous Main or Calibrations List activity.
• Delete (trash) button, which deletes the current calibration.
• Copy button, which allows you to create a copy of this calibration.
• Graph button, which shows a larger graph of the submerged line of the current calibration.

Tabbed Panels

It may be tabbed or swiped horizontally to switch between different screens of the Base page. Note that the Tabs are at the top of the screen on an Android, and at the bottom of the screen on an iPhone.

• The Calibrate screen provides the ability to measure a calibration.
• The Edit screen sets descriptive attributes of the calibration.
• The Troll screen provides an interface to use the calibration while trolling. Using the Troll screen does not change any persistent information of the calibration.
• The Gauge screen provides an interface to define a Gauge, which is a set of calibrations for the same rig at different speeds.
• The Current screen provides an interface to use the gauge to measure the Velocity (Speed and Direction) of the water current.

The Help buttons show brief messages explaining this section of the app, and provide a link to more details in the user’s guide.

Calibration Screen

The Calibrate Screen of the Base activity has several parts. It provides the ability to define all the data, including speed, rod tip height, and line angle measurements, which are the basis of a depth curve. It may be scrolled vertically to focus on the top or bottom sections.

The subpanels of the Calibration screen are, from top to bottom:

Graph Section and Speed Control Section

These sections are shown in the Calibration screen mainly as a convenience to show the line profile as the calibration is being measured. For complete documentation see the Trolling screen article.

GPS Section

Turn on the GPS switch to use the device’s GPS sensors to determine the actual boat speed.

Alternatively, read the boat speed from the boat’s marine electronics, the boat’s speedometer, or other means. Keep the boat speed constant at the speed recorded for the calibration.

Angle Measurements Section

The Measurements section shows the line angle measurements that make up the Trolling Angles calibration.