Your fish finder already tells you how deep the fish are... but how do you know how fast you should troll so that your lure rides at that depth? Wonder no longer! This handy calculator will recommend a speed based on information you provide.

The advanced algorithm takes into account several variables which can affect the depth of your lure as you move across the water, including:
- the type of line; some lines are more buoyant than others
- the diameter of the line; thicker lines have more drag in the water, and will ride higher as speed increases
- the amount of line you have in the water; longer lines allow for deeper trolling at higher speed
- the weight of the lure; heavier lures sink further than lighter ones at a given speed

Once you enter this information, and tell it how deep you want to fish, the app can estimate a trolling speed to allow you to fish at your desired depth.

What’s New

Version 1.0

This app has been updated by Apple to use the latest Apple signing certificate.

Ratings and Reviews

3.2 out of 5
6 Ratings

6 Ratings

Flyingmike218th ,


Braid line is not listed and the app is set up so as to yield only the trolling speed. I need trolling speed as an optional value in order to calculate the depth where the lure will ride. This app has potential so please keep revising.

AmacDaddy5 ,

Needs more

Doesn’t have an option for lead core line. Also, it would be nice to set the speed and have it tell me the depth of my lure.

jpn17110 ,

Too limited

Top lure weight is only 1oz. If you use 2 or 3oz like me this app doesn't help. Also, sometimes trolling speed needs to be the constant and line length the variable. Good concept but not very useful yet.

App Privacy

The developer, Thomas Crocker, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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