How to Use a Downrigger | Target Trolling Depth

Setting up a downrigger for the first time can feel like a lot of hardware doing a simple job. The idea is straightforward: you lower a heavy weight on a cable to push your lure down to where the fish are, and clip your fishing line to that weight. When a fish bites, the clip releases so you fight the fish on your rod alone. Here’s how to run one cleanly from deployment to landing.

Rig the Downrigger Before You Troll

Start with the downrigger mounted where you can reach the handle and reel comfortably, but well away from the propeller to keep the cable clear. The boom should sit perpendicular to the side of the boat when it’s deployed. Cannon’s official rigging guidance stresses following the manual for your specific model, since mounting hardware and cable routing vary. Most electric models run on a standard 12V boat system; use marine-grade wiring and protect the cable from sharp edges and water exposure.

Before you drop the weight, spool the cable evenly and attach your cannonball. Many anglers add a stopper bead about 6 feet above the weight on electric models — it stops the ball from crashing into the pulley if you reel too far. You’ll also want the release clip threaded onto the line before you set it.

What Depth Should You Set?

Your fish finder is the key tool here. Cannon’s downrigger basics explain that the whole point is placing bait at a specific, controlled depth that you’ve located with sonar — often a bait school, a thermocline, or a ledge where fish are holding. Don’t just guess: read the screen, then set the weight to sit just above where you marked the fish.

Weight size matters for holding depth. As a practical guide, an 8-pound ball works to about 50 feet at speeds near 2.5 MPH, 10 pounds handles 50–75 feet, 12–14 pounds covers 75–100 feet, and 16–20 pounds is for deeper water. For shallow trolling, 4–6 pounds is plenty.

The Step-by-Step Drop and Troll

1. Get the boat moving slowly in gear. This keeps the cable and line from tangling on deployment.
2. Let out 5 to 25 feet of line behind the boat (some setups use more in deep water), then clip the line into the release.
3. Lower the weight on the cable to your target depth. Watch the counter, but remember the gauge is a starting point — speed and current change the actual depth of your lure.
4. Put the rod in a holder with light tension on the line. You want the rod tip to load slightly so a strike pulls the line free cleanly.
5. Troll at a steady speed, watching your fish finder and adjusting depth as the bottom or bait moves.

Avoid These Common Downrigger Mistakes

The biggest errors are easy to avoid once you know them. Never let the downrigger free-spool uncontrolled — it causes tangles and stresses the cable. Don’t set the weight too close to bottom structure, trees, or other obstacles, or you’ll snag and lose gear. And never force the rod out of the holder on a strike before checking that the release clip actually opened; if it didn’t, you’ll pull the whole rig instead of just the fish. Cannon’s downrigger basics page covers the full rig and deployment logic.

When a fish hits and the clip pops, the fight happens on your rod. The weight stays down at depth, which means you’ll want to retrieve it — either by hand-cranking or with the electric motor — before you boat the fish or reset. A productive pattern is to mark fish on the finder, make a pass at that depth, and adjust on the next turn.

If you’re shopping for your first rig, the choice between manual and electric mostly comes down to how often you reset. Manual units are lighter and cheaper; electric models save your arm on deep water and long days. Our tested roundup of the best electric downriggers breaks down which ones hold up on the water.

The counter is a guide, not gospel. Boat speed, current, and the weight’s shape all shift the actual depth, so keep an eye on the fish finder and fine-tune as conditions change. Let the sonar be your final judge.

FAQs

How does a downrigger release clip work?

The release clip holds your fishing line against the downrigger cable so the lure drops to the target depth. When a fish strikes, the tension pulls the line free from the clip, letting you fight the fish without the weight attached. The clip stays on the cable and comes up when you retrieve the downrigger.

Can you use a downrigger without a fish finder?

You can, but you’ll be fishing blind. A downrigger’s advantage is holding a precise depth, and without sonar you’re guessing where the fish are and where the thermocline sits. Most serious trolling setups pair the two so each pass you make is informed by what’s below the boat.

How much line should you let out before clipping into the downrigger?

Setback depends on water depth and how close you’re fishing. For close-quarters work, 3–4 meters is enough; in deep water, anglers often use 40–50 meters to let the lure settle behind the boat and away from the wake.