AnglerSpecs is a free set of calculators for the rigging questions that come up every season: how much trolling motor thrust you actually need, how long a battery will last running LiveScope on the ice, what your prop slip is really telling you, and what the Coast Guard's formula actually says about your transom.
Every calculator here is built from published spec sheets, manufacturer data, or — where it exists — the actual federal regulation, with the assumptions stated plainly rather than buried. Where a number is an estimate, we say so.