There is a way to know how deep you are trolling; I’ve written and solved the equations that determine trolled depth and have applied the results to most trolling situations. … See more

The underwater profile of the line as it is trolled through the water is shown for a typical freshwater trolling condition in the below picture (black graph). Using an anchor loc… See more

Two of the factors have a relatively small effect. The least important is line strength-at least within the line strengths used for a typical trolling situation. What counts is the line diamet… See more

Note that these curves are very shallow, meaning depth changes are minor for significant changes in line strength. If, for example, we look at a narrow range of four and six-pou… See more

All of these calculations assume that we know our trolling speed. If a current is flowing in a river, we must make our measurements relative to the water. Speed along a sho… See more