Precision Trolling Data, LLC is an independent company that documents the diving depth of popular fishing lures such as crankbaits and also common trolling hardware such as diving planers and also sinking lines like lead core. Precision Trolling Data uses highly trained scuba divers and sophisticated scuba techniques to actually observe lures and trolling gear as they are functioning underwater!

         That’s right, at PTD we go underwater to literally get a “fish’s view” of popular trolling products. The goal of this rather unique research is to determine exactly how deep various lures and trolling gear will dive based on key variables such as lead length, trolling speed and line diameter. In turn, avid anglers can use this data to literally aim their favorite baits and trolling gear at fish they locate with the help of modern sonar.


        Welcome to the home of Precision Trolling Data, LLC. Precision Trolling combines both the art and science of trolling into the ultimate depth control form of fishing. Regardless of what species an angler might be targeting or what lure he or she may be trolling with, the fundamental question on the mind of all trollers is “how deep does that dive”?

         Without this critical piece of fishing information anglers are literally trolling blind or using time consuming trial and error methods to determine the most productive lead lengths and trolling speeds. The Precision Trolling Data staff uses modern scuba diving techniques to document, confirm and also replicate the actual diving depth of popular crankbaits, diving planers, sinking lines like lead core and a host of other common trolling devices.

         Each crankbait or trolling device is unique and has it’s own dive profile. Lures and trolling hardware are tested by trolling past a scuba diver using a series of lead lengths to determine the natural diving ability of a lure or device. This dive profile was originally dubbed a “Dive Curve” more than two decades ago when Precision Trolling first started publishing their findings in graph formate within the landmark book Crankbaits In-Depth and later the Precision Trolling, Precision Trolling Big Water Edition and Precision Casting books series.

         During the testing process, the variables associated with trolling including line diameter, line type, lead length and trolling speed are closely monitored to establish a set of standards that are easily duplicated by any angler who wishes to get the most from Precision Trolling Data.  

          All of Precision Trolling Data information, whether in written or app, is protected by Copyright.

Mark & Mari Romanack   Keith Kavajecz & Gary Parsons

Get The App

Data is sold via Apple or Google on your device. Pricing listed as in-app purchases on the device.

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App data sold individually @ $1.99 & $2.99 each or by Lifetime Membership $109.99

Lifetime Membership includes all of the data we have tested for the this trolling app to date and updates new data as it is added at no additional cost. ** Lifetime Memberships are tied to the Apple or Google ID that it is purchased on. You may transfer membership to a new or additional device that uses the SAME ID but is


*See in-app purchase agreements by Apple & Google Play.

*prices may change at any time.

Our Team

Mark Romanack
Mari Romanack
Keith Kavajecz
Gary Parsons
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General Questions



Should you need assistance please email us. If you don't get a response immediately be patient. We may be out of the office testing lures, filming tv or just plain fishing! If you are having technical issues with the app, see the FAQ tab. Tech questions are specific to your device so have that information available.

Mark & Mari Romanack, Keith Kavajecz & Gary Parsons


Please email Mari with all questions and she will respond as time allows.

[email protected]




Precision Trolling Data App is protected by

U.S. Patent No. 7,113,449 entitled

“Marine Electronics With Lure Depth Analyzer”

and all it's content is copyright protected.

© 2020 Precision Trolling Data, LLC