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Fish finders · Castable sonar · Our take
Deeper CHIRP+ 3 Sonar
Deeper CHIRP+ 3 Sonar
A compact castable sonar that gives coarse anglers a much clearer look at depth, weed and features from the bank — without needing a boat or an internet signal.
- Three-frequency CHIRP sonar with narrow, medium and wide beams.
- Scans from 15 cm down to 100 m, depending on conditions and setup.
- Castable connectivity range reaches up to 120 m via Wi-Fi, with no internet connection required.
- Battery life is up to 15 hours with GPS switched off, or up to 9 hours with GPS on.
Make sure it’s the right one. This review covers the Deeper CHIRP+ 3 Sonar, the compact three-frequency CHIRP castable model, not the similarly named CHIRP+ or CHIRP+ 2 units.
Tackle Index Score
Tackle Index score
A high-quality, versatile castable sonar for anglers who want more confidence when reading unfamiliar water.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality9.4/10
- Performance9.6/10
- Impact on Fish Catching8.8/10
- Ease of Use8.6/10
- Value for Money8.8/10
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Who it suits
Is it right for you?
Great for
- Carp and coarse anglers fishing unfamiliar venues. It can help you build a picture of depth changes, weed and lakebed features before choosing where to place the rods.
- Bank anglers who like to map productive areas. The castable design and optional GPS use make it useful for finding and revisiting spots rather than relying on guesswork.
Maybe skip if
- Anglers wanting a completely automatic fish-finding answer. Sonar gives you information, but you still need to interpret the screen and match it with what the water is doing.
- Anyone fishing tiny ponds where depth and features are already obvious. The extra kit may be more faff than it’s worth when you can see the likely spots from the bank.
The lowdown
Introducing the Deeper CHIRP+ 3 Sonar
A compact castable sonar that gives coarse anglers a much clearer look at depth, weed and features from the bank — without needing a boat or an internet signal.
- Three-frequency CHIRP sonar with narrow, medium and wide beams.
- Scans from 15 cm down to 100 m, depending on conditions and setup.
- Castable connectivity range reaches up to 120 m via Wi-Fi, with no internet connection required.
- Battery life is up to 15 hours with GPS switched off, or up to 9 hours with GPS on.
Quick verdict
Verdict
The Deeper CHIRP+ 3 is a cracking bit of kit for anglers who want to understand a new lake before committing the rods. Its three CHIRP beams give you useful detail from tight spots through to broad searches, while Wi-Fi connectivity keeps it usable without mobile signal.
It won’t magically find a carp or replace time spent watching the water, but it can take a lot of guesswork out of depth, weed and feature finding. For serious feature-finding from the bank, it’s a very capable bit of tackle.
A high-quality, versatile castable sonar for anglers who want more confidence when reading unfamiliar water.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality
- 9.4/10
- Performance
- 9.6/10
- Impact on Fish Catching
- 8.8/10
- Ease of Use
- 8.6/10
- Value for Money
- 8.8/10
The compact build, ABS enclosure and titanium inserts point to a well-equipped unit designed for regular bank use.
Three CHIRP frequencies, up to 15 scans per second and a 15cm-to-100m scanning range give it plenty of capability.
It can improve spot choice and presentation, although it supports good watercraft rather than replacing it.
Casting and Wi-Fi connectivity are straightforward, but interpreting sonar returns and making repeatable scans takes practice.
The combination of detailed beams, long potential battery life and GPS-friendly mapping makes it a strong option for serious feature-finding.
Head to head
How it stacks up
Side by side with the closest kit we've reviewed. This updates as we add more reviews.
Deeper
Deeper CHIRP+ 3 Sonar (this one)
Top scorer
Top scorer
Scores are our own, out of 10. Best in each row is in green. Prices change, so check the latest before you buy.
The full rundown
Everything you'll want to know about the Deeper CHIRP+ 3 Sonar
Finding a decent spot from the bank can be half the battle. You can pace a swim, plumb around and stare at the water until your eyes go square, but some features stay hidden. That’s where the Deeper CHIRP+ 3 Sonar comes in. It’s a small castable fish finder designed to give you a better look below the surface without dragging a boat into the equation.
The idea is dead simple. You cast the sonar out, retrieve it steadily and view the information on a compatible phone or tablet. Depth changes, weed, lakebed features and possible fish returns can then be assessed from the bank. It doesn’t do the thinking for you, but it can turn a vague-looking swim into something you can actually plan around.
At just 94g, the unit isn’t a hefty lump hanging off the end of your line. That matters when you’re working along a margin, searching a far-bank shelf or making repeated casts to map an area. You’ll still want sensible tackle and a reliable connection, naturally. This isn’t an invitation to clip it onto your finest little float rod and bosh it into the next county.
The CHIRP+ 3’s big selling point is its three-frequency sonar. The narrow beam runs at 675kHz with a 7-degree cone angle, giving you a focused look and target separation down to 1cm. That’s useful when you’re trying to understand a small gravel patch, a crease or the edge of a clear spot in weed.
The medium beam uses 240kHz and a 20-degree cone angle, while the wide beam runs at 100kHz with a 47-degree cone angle. In plain English, the wider option covers more water when you’re searching, and the tighter options help you zoom in on the detail. You can start broad, then get more precise once something catches your eye.
For coarse fishing, that flexibility is proper handy. You might be looking for a depth change on a bream lake, a clean strip in a weedy tench pool or a subtle shelf where carp patrol. A sonar reading won’t tell you the whole story, but it can point you towards areas worth fishing and help you avoid plonking a rig in the thick stuff.
The scanning range runs from 15cm down to 100m, although most stillwater and canal anglers will be working well within the practical part of that spread. The unit can scan at up to 15 times per second, which helps when you’re retrieving it steadily rather than leaving it sat in one place.
Connectivity is handled by Wi-Fi, with a quoted casting range of up to 120m. No internet connection is required, so you’re not stuffed just because the venue sits in a signal blackspot. That’s a nice touch for remote lakes and quiet stretches of river where your phone usually gives up the ghost.
Battery life is quoted at up to 15 hours with GPS switched off, dropping to up to 9 hours with GPS enabled. GPS can be useful when you want to map areas and return to them, but you don’t need it for every quick recce. The package includes the sonar, night cover, USB charging cable, attachment bolts and neoprene pouch, so the basics for keeping it protected and ready are covered.
Specifications
The nuts and bolts
- Weight
- 94 g / 3.31 oz
- Dimensions
- Approximately 6.5 cm / 2.55 in diameter
- Sonar
- Three-frequency CHIRP
- Beams
- 675 kHz narrow, 240 kHz medium and 100 kHz wide
- Scanning depth
- 15 cm to 100 m / 6 in to 330 ft
- Connectivity
- Wi-Fi, up to 120 m / 394 ft; no internet required
Specs checked with Deeper, Oct 2026.
Spot a model or spec change?
Our take
The angle
This is less about waving a magic fish-finding wand and more about building a proper picture of the lakebed. Cast it, retrieve it steadily and the app can help you map depths, spot changes and work out where a rig might actually sit.
The standout feature is the three-frequency CHIRP setup. The narrow beam is handy when you’re homing in on a small target, while the wider beams give a broader view when you’re searching a new swim. That makes the CHIRP+ 3 much more versatile than a basic single-beam gadget.
What you’re buying
A tiny sonar with three ways to read the water
The CHIRP+ 3 is a compact ABS-bodied sonar with titanium inserts, measuring approximately 6.5cm across. It’s built to be cast out and retrieved, rather than mounted permanently to a boat. That makes it a natural fit for bank anglers who want extra information without a huge pile of kit.
Its three beams give you different views of the same water. The 47-degree wide beam is the search tool, the 20-degree medium beam gives a more balanced picture and the 7-degree narrow beam is for concentrating on a specific area. That progression makes sense on the bank: search first, investigate second, clip up and fish third.
The narrow beam’s stated 1cm target separation is particularly useful when you’re trying to distinguish small details. The medium and wide beams offer 2.4cm target separation. Used sensibly, that can help you understand whether a mark is likely to be a feature, weed or something moving through the swim.
Worth knowing. The sonar only tells you what’s beneath its position at that moment. Retrieve speed, line angle, boat traffic, wind and surface conditions can all affect how useful the picture is. Keep your casts controlled and repeat a promising scan before making a big decision.
On the bank
Best used as a watercraft helper
This is aimed squarely at anglers who enjoy working a venue out. On a new carp lake, it can help identify shelves, bars, drop-offs and cleaner areas. On a coarse water, it may help you find depth changes and likely holding zones for bream, tench, roach or carp. The value comes from combining the screen with what you see above the surface.
A good approach is to scan before setting up properly, where the rules allow it. Work a few lines through the swim, compare the depths and look for changes rather than chasing every little mark. Once you find a likely spot, repeat the cast, note the distance and clip up. That’s much more useful than blindly lobbing it about for hours.
GPS can make the CHIRP+ 3 more useful for anglers who fish larger waters or return to the same venue regularly. With GPS off, the quoted battery life reaches up to 15 hours. Switch GPS on and it drops to up to 9 hours, so use the mapping side when it genuinely helps rather than leaving it running for the sake of it.
Worth knowing. Don’t let sonar replace proper watercraft. Bubbling, fizzing, showing fish, bird activity, wind direction and the season still matter. The best result comes when the CHIRP+ 3 confirms a sensible idea, rather than convincing you to ignore everything else.
Quick answers
The bits you’ll want to know before buying
Can you use it in shallow water? Yes. Its stated scanning range starts at 15cm, though you’ll still want to consider how close the sonar is to the bank, the angle of the line and whether your retrieve is giving it a clean look at the bottom.
Is 120m enough casting range? For most bank fishing, yes. A quoted range of up to 120m gives you plenty of room to investigate a far-bank margin, a central bar or a long chuck on a big reservoir. Your actual usable distance will depend on casting accuracy, line choice and the venue.
What comes in the box? You get the CHIRP+ 3 sonar, a night cover, USB charging cable, attachment bolts and a neoprene pouch. The pouch is handy for keeping the unit protected between sessions, while the night cover helps when you’re scanning in low light.
On paper
Pros & cons
What we like
- Three sonar frequencies cover detailed feature work and broader searches.
- Lightweight at 94 g, so it’s straightforward to cast with suitable tackle.
- Useful target separation down to 1 cm with the narrow beam.
- Wi-Fi works without an internet connection, which is handy on remote waters.
- GPS can help turn exploration into repeatable spots and mapped swims.
Worth knowing
- You’ll need to spend time learning how to read the returns properly; it isn’t a shortcut to instant results.
- GPS use reduces the quoted battery life to up to 9 hours.
- Casting a sonar accurately and retrieving it consistently still needs sensible tackle and a bit of practice.
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Your questions answered
What anglers want to know
The stuff you’d ask your mate on the next peg. Straight answers, no waffle.
01Can the Deeper CHIRP+ 3 work without mobile internet?
Can the Deeper CHIRP+ 3 work without mobile internet?
Yes. It connects to your phone or tablet by Wi-Fi, so an internet connection isn’t required while you’re scanning.
02How deep can the Deeper CHIRP+ 3 scan?
How deep can the Deeper CHIRP+ 3 scan?
Its stated scanning range runs from 15 cm down to 100 m. Actual results depend on water conditions, the swim and how you use it.
03Which beam should I use for carp and coarse fishing?
Which beam should I use for carp and coarse fishing?
Use the wide beam to search a bigger area, then move to the medium or narrow beam when you want more detail around a feature or suspected spot.
What anglers say
The word from the bank
Our read: verdict. The strongest reasons to choose it are three sonar frequencies cover detailed feature work and broader searches. and lightweight at 94 g, so it’s straightforward to cast with suitable tackle.; the main trade-off is you’ll need to spend time learning how to read the returns properly; it isn’t a shortcut to instant results..
Our take on the feedback
Why it appeals
Checked Sept '26 — “Three sonar frequencies cover detailed feature work and broader searches.”
Best fit
Checked Sept '26 — “Carp and coarse anglers fishing unfamiliar venues: It can help you build a picture of depth changes, weed and lakebed features before choosing where to place the rods.”
Worth knowing
Checked Sept '26 — “You’ll need to spend time learning how to read the returns properly; it isn’t a shortcut to instant results.”
Tackle Index’s take from the product details and fishing fit we checked. We haven’t found enough independent public feedback to call this an angler consensus yet.
Angler score
What our readers rate Deeper CHIRP+ 3 Sonar
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