The Lead Core Depth Calculator is the most precise app for calculating depths of fish-filled bodies of water. This app offers a great deal of customization and allows you to set the amount of line that you wish to troll, along with your preferred trolling speed.

In order to use this app, you need to first set your location. Once you have done this, you can set the amount of line that you wish to troll, along with your preferred trolling speed. The way that this app is designed is such that it will automatically start monitoring your location when you start the process of trolling, and it will continue doing so even if you stop the process.