1.
Tap START SENSOR — allow motion access if prompted
2.
Portrait: align the TOP EDGE with your fishing line
Landscape: align the TOP EDGE with your fishing line
3.
Tap LOCK to freeze the angle reading
4.
Enter your line counter reading → depth calculates instantly
5.
If angle reads backwards, tap INVERT
Depth = line × sin(angle) • Straight-line approximation