A document outlining the relationship between the amount of line let out and the corresponding depth achieved by a specific trolling device. These documents, often in portable document format, assist anglers in precisely controlling the depth at which their lures are presented when using those trolling devices.
Such guides are invaluable for maximizing fishing success by allowing for accurate targeting of fish holding at specific depths. They provide a practical reference, especially for anglers new to using specialized trolling equipment, and contribute to consistent lure presentation. Historically, developing such charts involved extensive field testing and data collection to establish reliable depth curves for various trolling speeds and line types.
