Trolling Angles

Create Your Own Trolling Depth Charts

Trolling Angles – A Mobile App to Determine Trolling Depth

https://trollingangles.com/trolling-in-current/

Trolling in Current – Trolling Angles The Trolling Angles app allows you to measure and use the speed and direction of water currents, while trolling, using only your own fishing rig and your smartphone.

https://trollingangles.com/troll-at-any-speed/

Troll at any Speed – Trolling Angles The Trolling Angles app cannot tell you at which speed you should troll your lure.  That’s between you and the fish.  But it can show the effect speed has on the depth curve.

https://trollingangles.com/trolling-angles-with-downriggers/
You probably don't know the depth of your downrigger cannonball. This 2 year old post is worth repeating.

Trolling Angles with Downriggers – Trolling Angles When trolling with downriggers, compared to long-line trolling, you may think you understand how deep your lure is, but you may be wrong. The rigger has a line counter, and the line is somewhat vertical. The trolling rigs behind the cannonball may be short enough or neutral enough that one does not....

https://trollingangles.com/creating-and-saving-a-trolling-depth-curve/

Creating and Saving a Trolling Depth Curve – Trolling Angles The Trolling Angles app makes it easy to create a new depth curve chart configuration by measuring the line angles while deploying your trolling line, and to use the chart immediately.  You do not need to enter any descriptive information such as lure type, speed, line size, or sinker weight.

https://trollingangles.com/snap-weights/

Snap Weights – Trolling Angles A snap weight is a heavy sinker that is attached to the line with a pincher-like clip.  It can be placed at any point of the line.  A snap weight makes the line’s physics and forces and the resulting curve geometry much more complex, but because Trolling Angles measures the actual resulting line...

Patent Granted!

Trolling Angles Patent Granted! – Trolling Angles Trolling Angles Patent Granted! Post author By Admin Post date April 4, 2023 Categories In Uncategorized No Comments on Trolling Angles Patent Granted! I am very pleased to announce that Patent 11473893 has been granted by the US Patent Office as of October 18, 2022.  This patent covers the method ...

https://trollingangles.com/error-analysis/

Error Analysis – Trolling Angles Error Analysis Post author By Admin Post date June 12, 2022 Categories In Uncategorized The first question often asked about Trolling Angles is “is it accurate?”.  I have very little doubt about the theory of the physics of the method and the math used in the Trolling Angles app. Years of softw...

The Effect of Speed on Trolling Depth
https://trollingangles.com/the-effect-of-speed-on-trolling-depth/

The Effect of Speed on Trolling Depth – Trolling Angles The Effect of Speed on Trolling Depth Post author By Admin Post date August 26, 2021 Categories In Uncategorized No Comments on The Effect of Speed on Trolling Depth There is a aphorism in the engineering world: “In theory, there is no difference between theory and practice; but in practice, there...

Downriggers and Sonar
https://trollingangles.com/downriggers-and-depth-finders/

Downriggers and Depth Finders – Trolling Angles Downriggers and Depth Finders Post author By Admin Post date August 26, 2021 Categories In Uncategorized No Comments on Downriggers and Depth Finders Here are some thoughts on the geometry of downrigger lines and 2-D sonar displays. This example is based on the data from the previous post “Trollin...

Trolling for Salmon out of Ketchikan

Trolling Angles with Downriggers

When trolling with downriggers, the depth of your lure seems relatively un-mysterious, compared to long-line trolling. The rigger has a line counter, and the line is somewhat vertical. The trolling rigs behind the cannonball may be short enough or neutral enough that one does not need to take a lure diving depth into account much.

It’s easy to assume that the lure is being presented at about the depth shown by the downrigger reel. This is a very inaccurate assumption. Or, one can estimate the difference, but this is hard to do accurately too.

Here is a Trolling Angles calibration for a run with a cannonball, a flasher and a cut herring, at an indicated GPS speed of about 2.1 mph, near Ketchikan Alaska. We took only 4 measurements as we deployed the rig while fishing.

With 70 feet of cable, the bait is only about 51 feet down. This is a significant difference.

The app accounts for the height of the release at which the reel is zeroed (the “rod tip height”) and the angle of the unsubmerged cable at each measurement, and it accounts for the shape of the total curve of the line below the surface.

The graph shows the profile of the submerged cable.

Trolling Angles v1.0.4 is now available on Google Play.

https://play.google.com/store/apps/details?id=com.trollingangles.ta

Trolling Angles