Canyon Slayer

KnotLogic LLC

In-app purchases

About this app

Canyon Slayer is the offshore tuna fisherman's copilot for the Mid-Atlantic canyons off Montauk and Block Island.

LIVE SST BREAK DETECTION — FREE
See sea-surface temperature heatmaps with eddy and meander contours, refreshed every two hours. Spot the breaks and warm-water edges that hold bait — and the bluefin, yellowfin, and bigeye tuna that follow.

CANYON SLAYER PRO — AI + LIVE FLEET
Upgrade to Pro and fish smarter:
• AI FISHING GUIDE — Tap "Find Fish" for real-time analysis from an AI trained on what offshore captains read: temperature gradient, edge orientation, distance, and bait alignment. Dialed in for tuna, mahi, marlin, and wahoo — trolling or chunking.
• LIVE FLEET (AIS) — See where the boats are actually working the canyons in real time. Tap any boat for its name, speed, course, and last AIS fix — and get a one-tap route to it.
• FLEET-AWARE AI — Find Fish weighs live fleet activity alongside the SST breaks, so the AI knows where the bite is confirmed.

CREW & CHAT — FREE
Make a crew, share the invite code, and see your buddies' boats live on the map. Private crew threads, open canyon rooms (Hudson, Block, Atlantis, Veatch, Hydrographer) and Dock Talk for everything else. Position sharing is opt-in and foreground-only — flip it off and you vanish from every map immediately.

THE SPOTS TAB — FREE
Every named mark in one searchable list: 79 spots with depths, coordinates and classic Loran TD numbers. Sort by nearest with live distance, bearing and run time at 25 knots.

Every new user gets a 7-day free trial of Pro — full access, no card required. After the trial, Pro is $17.99/month or $149.99/year (auto-renewing, cancel anytime in Google Play). Maps and SST stay free forever.

NIGHT BITE — OVERNIGHT DRIFT PLANNER
Plan a night drift of the canyons: moon phase and solunar major/minor windows, ranked best-bite times for swordfish and bigeye, live drift prediction from HF-radar surface currents plus wind, and a night-drift AI game plan. Works offline.

40+ NAMED CANYON SPOTS
Hudson, Veatch, Hydrographer, Block, Atlantis — plus East Tails, Bigeye Mountain, Hot Dog Ridge, Glory Hole, and dozens more. Tap any spot for distance, bearing, and run time at 25 knots.

OFFLINE-READY
Download tile packs for five offshore regions so the map works without cell service far from shore. Trip tracks, waypoints, and catch photos stay on your device.

EVERYTHING ELSE
NOAA buoy weather and real-time water temps. Chlorophyll bait overlay. USGS canyon polygons. 200m shelf-edge contour. Historical SST date picker. GPS tracking with distance and bearing to any spot.

Whether you're trolling the tuna grounds, chunking the canyons, or running offshore for a night swordfish drift, Canyon Slayer puts live sea-surface temperature, AI fishing intel, live fleet awareness, and offshore navigation in your pocket.

What’s new

Hourly satellite SST (Pro): water temps straight from GOES, refreshed every hour — up to 30x fresher than the daily blend on clear days. New Blend | Hourly toggle shows live sky coverage. Tidier map: one compact SST switch, temp breaks show just the number. Chat tab is now an inbox: crews, canyon rooms and Dock Talk in one list with previews and unread badges.