Frequently Asked Questions
How is trolling depth calculated from line angle?
It uses geometry: running depth = line out x cos(angle from vertical), and horizontal setback = line out x sin(angle). A line near vertical runs deep and close; a flat line runs shallow and far back.
Will my lure really run at this depth?
Not exactly. This is straight-line geometry. True dive depth also depends on lure design, added weight, line diameter, and especially boat speed, so confirm with a dive chart or line counter.
How do I get my lure to run deeper?
Slow down, let out more line, or add weight to steepen the line angle. Thin braided line also cuts the water at a steeper angle than thick mono and dives deeper for the same length out.
What does an angle of 0 degrees mean here?
Zero degrees from vertical means the line goes straight down, so the running depth equals the full length of line let out and the horizontal setback is zero.
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Fishing & Hunting Disclaimer: Estimates only. Verify regulations and practice safety.
This calculator is for educational and informational purposes only. Ballistics, archery, trolling-depth, and yield figures are simplified estimates and do not replace field verification, sighting-in, or chronograph data. Bag limits, seasons, legal methods, and equipment rules vary by state and locality and change frequently, so always confirm current regulations with your state wildlife agency before fishing or hunting. Follow all firearm and tree-stand safety practices, including a full-body harness when elevated. Never rely on these estimates for a shot you are not confident in.