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Start with the water
A lake is not uniform. Depth changes, weed edges, shade and inflows narrow the whole surface down to a few places fish can actually be. You learn to see them before anything else.
Free on iPhone · Runs entirely on your device
Learn to read the water.
Anyone can be handed a map of good spots. Water Detective teaches you to make one yourself — a field school for anglers built around one skill: stand in front of unfamiliar water and work out, from what you can see, where the fish are and what they are doing.
How it works
Not a list of articles. Each step is a set of drills you work inside, and every drill you clear files a Field Note in your notebook.
A lake is not uniform. Depth changes, weed edges, shade and inflows narrow the whole surface down to a few places fish can actually be. You learn to see them before anything else.
Temperature, light, oxygen and pressure move fish on a schedule. Watch a day run through, learn where a school goes when the wind turns, and start predicting instead of guessing.
Rod, line, lure and terminal tackle are decisions with physical consequences. Build outfits against real scenarios and find out exactly why each choice does or does not work.
Every drill you clear files a Field Note. Notes assemble into an illustrated journal, open new regions, and become the record of what you now know. Everything stays on your device.
Five islands around a lighthouse
Each island is a small animated environment with its own drills. Clear them, fill your notebook, and the next water opens.
Read the environment first
Before a single cast, a water body tells you where fish can be. Depth changes, weed lines, current seams, shade, inflows and sunken timber narrow a whole lake down to a handful of places worth your time.
What moves them, and when
Fish do not sit still. Temperature, oxygen, light, pressure, season and predators push them between holding water and feeding water on a schedule you can learn to anticipate.
Every choice has a physical reason
Rod, reel, line, hook, sinker, float and lure are not preferences. Each one changes how far you cast, how deep you fish, how the bait moves and how much the fish can detect.
Technique, measured
Accuracy, knot integrity, retrieve control and a quiet approach are the four skills that decide whether the reading you did actually converts. Every drill here is scored.
Eight waters, one notebook
Each region behaves differently. Work through its puzzles, meet its species, learn its local tactics, and the pages you fill become the record of what you now know.
Expedition Journal
Regions open one at a time, each with its own puzzles, species, local tactics and hidden discoveries.
Spot one while it is happening and it opens material you cannot reach any other way.
Most freshwater predators feed hardest in the low-angle light either side of sunrise and sunset, when prey silhouettes are visible to them and they are hard to see in return. Midday sun in clear water pushes the same fish deep or into shade.
FILED · MASTERED 92Thirteen to earn. A few of them:
Contact
Spotted an error on a species card? Want a water added, or a tactic argued with? Send a note — replies come from coraking3849@gmail.com.
Free on the App Store. No account, no ads, no purchase flow — your notebook stays on your phone.
Download on theApp StoreLearn it once. Use it on every trip.