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Fish finders · Sonar tools · Our take
Deeper CHIRP+ 3 Fish Finder
Deeper CHIRP+ 3 Fish Finder
Small enough to sling in the tackle bag, clever enough to map depths, weed and features from the bank. The CHIRP+ 3 brings serious sonar detail without dragging a boat onto the lake.
- Three CHIRP frequencies cover narrow, medium and wide scanning.
- Narrow beam offers a 7° cone and 1 cm target separation.
- Wi-Fi connection reaches up to 120 m in suitable conditions.
- Rechargeable battery runs for up to 15 hours and charges over USB-C.
Make sure it’s the right one. This review covers the Deeper CHIRP+ 3 Fish Finder, not the standard Deeper CHIRP+ or a different Deeper model.
Tackle Index Score
Tackle Index score
A feature-packed and genuinely useful fish finder for anglers who’ll put the information to work, rather than just stare at a screen.
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 anglers mapping unfamiliar lakes. It helps reveal depth changes, weedbeds and features before you commit to a spot.
- Coarse anglers fishing from the bank. The wide and medium beams give a useful picture when you’re trying to understand a swim without a boat.
Maybe skip if
- Anglers who want a completely hands-off gadget. You’ll still need to interpret the display and combine it with proper watercraft.
- Fisheries with strict gadget or fish-finder rules. Some venues may limit or ban electronic sonar, so check the rules before chucking it out.
The lowdown
Introducing the Deeper CHIRP+ 3 Fish Finder
Small enough to sling in the tackle bag, clever enough to map depths, weed and features from the bank. The CHIRP+ 3 brings serious sonar detail without dragging a boat onto the lake.
- Three CHIRP frequencies cover narrow, medium and wide scanning.
- Narrow beam offers a 7° cone and 1 cm target separation.
- Wi-Fi connection reaches up to 120 m in suitable conditions.
- Rechargeable battery runs for up to 15 hours and charges over USB-C.
Quick verdict
Verdict
The Deeper CHIRP+ 3 is a cracking bit of kit for anglers who want a clearer picture of what’s under the float or lead. Its three CHIRP frequencies, sharp narrow beam and impressive depth range give you plenty to work with, whether you’re plumbing a new lake or checking a quiet margin.
It won’t replace watercraft, and it won’t magically put a lump on the mat. But used alongside a marker float, clipped-up leads and a bit of thinking, it can take a lot of guesswork out of finding depth, weed and features. Proper handy kit for serious coarse and carp anglers.
A feature-packed and genuinely useful fish finder for anglers who’ll put the information to work, rather than just stare at a screen.
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 ABS body, titanium inserts, protective accessories and sensible charging setup give it a well-equipped feel.
Three CHIRP frequencies, sharp target separation, fast scanning and a broad depth range make it versatile on the bank.
It can help you find better areas and present with more confidence, but it still relies on your watercraft and angling decisions.
The castable format and Wi-Fi connection are convenient, although interpreting sonar and managing a phone adds a learning curve.
For anglers who regularly fish new waters or want detailed swim information without a boat, the feature set is strong.
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 Fish Finder (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 Fish Finder
If you’ve ever spent half a morning plumbing a swim, clipping up, changing leads and still wondering what’s actually down there, the Deeper CHIRP+ 3 will make plenty of sense. It’s a small castable fish finder that beams sonar information back to your phone over Wi-Fi. No boat. No big echo-sounder head unit. No faff with a separate battery box.
That makes it a proper interesting tool for UK carp and coarse anglers. You can use it to build a picture of depth, contours, weed and underwater features before settling on a spot. It won’t do the thinking for you, mind. Watercraft still matters. But it can give you another useful bit of the puzzle when a new lake looks like a blank sheet of water.
The clever bit is the three-frequency CHIRP sonar. You get a narrow 675 kHz beam with a 7-degree cone, a medium 240 kHz beam with a 20-degree cone and a wide 100 kHz beam with a 47-degree cone. In plain English, you can switch between a tight, detailed look and a broader scan of what’s around the Deeper.
That narrow beam is particularly tasty when you’re trying to investigate a specific feature. It offers target separation down to 1 cm, which is the sort of detail that can help distinguish a clean area from nearby bits of weed or debris. The medium and wide beams offer 2.4 cm target separation, giving you a broader view without losing all the useful information.
For a carp angler, the best use is probably deliberate watercraft rather than endless gadget-gazing. Cast it around a new swim and you can start working out where the shelf drops away, whether a flat area is really as clean as it looks, and how the depth changes towards the island or margin. Then you can fish with a bit more purpose. That’s a lot better than chucking three rods at random and hoping for a screaming take.
It’s also useful for checking the margins. A 15 cm minimum depth means it can work in very shallow water, so you’re not limited to the main bowl of the lake. The wider beam can give you a general feel for a bay or near margin, while the narrow beam is better when you want to examine one likely-looking patch. Just remember that your cast and retrieve need to be controlled if you’re trying to build a sensible picture.
The 94 g weight is another big plus. It’s light enough to carry all day and won’t eat much room in the tackle bag. The ABS enclosure has titanium inserts, and the package includes a night cover, charging cable, two attachment bolts and a neoprene pouch. That’s a nice little bundle, especially if you’re the sort who likes to keep kit protected and organised rather than rattling around loose with the leads.
Battery life is up to 15 hours, which should cover a good few short sessions or a decent campaign of feature-finding. USB-C fast charging is dead handy too: 80 per cent in 60 minutes and full in 110 minutes. You’ll still want to arrive with it charged, obviously, but there’s less panic if you’ve forgotten to top it up before a quick evening visit.
There are limits. You need a compatible phone or tablet, and Wi-Fi range is quoted at up to 120 m, not a guaranteed distance in every swim. Trees, bankside clutter and general conditions can all affect a wireless link. You also need to learn how the display reads, because sonar returns aren’t always as simple as ‘fish here’. Used sensibly, though, the CHIRP+ 3 is a cracking way to turn an unknown swim into something you can actually understand.
Specifications
The nuts and bolts
- Weight
- 94 g / 3.31 oz
- Sonar
- Three-frequency CHIRP
- Beam options
- 675 kHz narrow, 240 kHz medium, 100 kHz wide
- Depth range
- 15 cm to 100 m
- Battery
- 3.8 V lithium-ion, 1300 mAh; up to 15 hours
- Connection and charging
- Wi-Fi up to 120 m; USB-C fast charging
Specs checked with Deeper, Oct 2026.
Spot a model or spec change?
Our take
The bank-side advantage
The big appeal here is portability. You can cast the sonar out, connect it to your phone over Wi-Fi and build a picture of the swim without lugging a boat, battery box or bulky echo sounder onto the bank.
That makes it especially useful on waters where boats are banned or where you’re moving between swims. The narrow CHIRP beam is the star of the show for picking out detail, while the wider beams help you get a broader feel for what’s happening below.
What you’re buying
A tiny sonar unit with a useful spread of beams
The CHIRP+ 3 is a compact castable sonar that sends readings to your phone or tablet via Wi-Fi. Its three-frequency setup gives you different ways to inspect the water: the 7-degree narrow beam for precise detail, the 20-degree medium beam as an all-round option, and the 47-degree wide beam for a broader scan.
The narrow beam’s 1 cm target separation is the headline figure for anglers who want to inspect a tight spot. The medium and wide beams offer 2.4 cm separation. Depth coverage runs from 15 cm to 100 m, so it’s comfortable checking shallow margins as well as deeper water.
The unit weighs just 94 g and uses an ABS enclosure with titanium inserts. It comes with a night cover, charging cable, two attachment bolts and a neoprene pouch. Battery life is up to 15 hours, with USB-C charging taking around 60 minutes to reach 80 per cent and 110 minutes for a full charge.
Worth knowing. The quoted 120 m Wi-Fi range is an upper figure, not a promise that every cast will behave exactly the same. Keep the phone in a sensible position, avoid burying it in a pocket and remember that bankside obstacles can affect the connection.
Best on the bank
A handy extra set of eyes under the surface
This is a strong fit for carp anglers exploring unfamiliar venues. Use the wide beam to get a feel for the overall swim, then move to the narrow beam when you find a likely bar, shelf, hole or clean area. Pair that with a marker float or lead and you can build a much more useful picture than either method alone.
Coarse anglers can get plenty from it too. It’s useful for understanding depth changes, locating weed and checking whether a quiet-looking margin has any shape to it. The shallow-water capability is particularly useful on canals, estate lakes and margin swims where a normal deep-water approach tells you very little.
It suits anglers who enjoy the detective work. You’ll need to spend time learning what the display is showing and avoid treating every return as a guaranteed fish. Used properly, it supports good angling rather than replacing it. Think of it as another tool in the armoury, not a shortcut to a bite-time.
Quick answers
The bits you’ll want to know before buying
Can it help you find fish? Yes, that’s part of what sonar is designed to do, but the real bank-side value is often mapping depth and features. Fish symbols and returns should be treated with a bit of caution. A good-looking spot still needs the right rig, bait and presentation.
Is the narrow beam always best? Not necessarily. It gives the most precise view, but its 7-degree cone covers less water. The wide beam covers more of the swim and can be better when you’re building a general picture. Swap between them rather than sticking rigidly to one setting.
Will the battery last a session? Up to 15 hours should be plenty for most day sessions and plenty of shorter trips. Charging over USB-C makes it easier to top up from a power bank, and the fast-charge figures are useful when you’re in a rush.
Worth knowing. Always check the rules of the venue before using a castable fish finder. Some fisheries are fine with them, while others restrict electronic fish-finding gear. A quick word with the bailiff can save a very awkward chat later.
On paper
Pros & cons
What we like
- Excellent detail from the 675 kHz narrow beam.
- Three beam options make it useful for both precise checking and wider scanning.
- Compact 94 g body is easy to carry and cast.
- Long claimed battery life with fast USB-C charging.
- Depth range from very shallow water down to 100 m.
Worth knowing
- You’ll need a compatible phone or tablet to view the sonar information.
- Reading sonar takes a bit of practice; it’s not a magic fish-catching button.
- Wi-Fi performance can be affected by distance, obstacles and the bank environment.
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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.
01How deep can the Deeper CHIRP+ 3 scan?
How deep can the Deeper CHIRP+ 3 scan?
Its stated depth range runs from 15 cm down to 100 m. For normal UK carp and coarse fishing, that gives you masses of headroom.
02Can I use the CHIRP+ 3 from the bank?
Can I use the CHIRP+ 3 from the bank?
Yes. It’s designed to connect over Wi-Fi to a compatible phone or tablet, so you can cast or position the sonar and view the readings from the bank.
03Which beam should I use for carp fishing?
Which beam should I use for carp fishing?
The 675 kHz narrow beam is the one for picking out detail and tight features. The 240 kHz medium beam is a useful all-rounder, while the 100 kHz wide beam gives a broader look at the swim.
What anglers say
The word from the bank
Our read: verdict. The strongest reasons to choose it are excellent detail from the 675 khz narrow beam. and three beam options make it useful for both precise checking and wider scanning.; the main trade-off is you’ll need a compatible phone or tablet to view the sonar information..
Our take on the feedback
Why it appeals
Checked Sept '26 — “Excellent detail from the 675 kHz narrow beam.”
Best fit
Checked Sept '26 — “Carp anglers mapping unfamiliar lakes: It helps reveal depth changes, weedbeds and features before you commit to a spot.”
Worth knowing
Checked Sept '26 — “You’ll need a compatible phone or tablet to view the sonar information.”
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 Fish Finder
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Owner reports
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Quick multiple-choice reports from people who say they own the Deeper CHIRP+ 3 Fish Finder. Not verified purchases, and kept separate from our score.
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