Photos: Deeper · supplied retailer imagery
Predator tools · Smart sonar · Our take
Deeper CHIRP+ 3 Smart Sonar
Castable triple-beam fish finder
A tiny castable fish finder with proper CHIRP firepower, three beams and enough range for serious predator work from the bank or boat.
- 94 g ABS castable sonar with triple-beam CHIRP technology.
- Three frequencies: 100 kHz, 240 kHz and 675 kHz, with 47°, 20° and 7° beam angles.
- Maximum scanning depth is 100 m / 330 ft, with connectivity up to 120 m / 394 ft.
- USB-C charging gives up to 15 hours of battery life, with 80% charge in 45 minutes.
Make sure it’s the right one. This is the Deeper CHIRP+ 3 Smart Sonar, not the smaller or older Deeper models. The key version markers are its triple-beam CHIRP system, USB-C charging and 94 g weight.
Tackle Index Score
Tackle Index score
A high-value bit of portable sonar for anglers who’ll actually use the information it provides.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality9.4/10
- Performance9.7/10
- Impact on Fish Catching9/10
- Ease of Use8.6/10
- Value for Money8.8/10
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Who it suits
Is it right for you?
Great for
- Predator anglers searching unfamiliar venues. It helps you identify depth changes, holes, shelves and likely bait areas before committing to a swim.
- Bank or small-boat anglers who want portable sonar. The compact 94 g body is far easier to carry and deploy than a traditional fixed fish-finder setup.
Maybe skip if
- Anglers fishing tiny, familiar ponds. If you already know every feature and depth, the extra kit may feel like a bit of faff.
- Anyone wanting a completely screen-free approach. This is a smart sonar system, so a compatible connected device is part of the overall setup.
The lowdown
Introducing the Deeper CHIRP+ 3 Smart Sonar
A tiny castable fish finder with proper CHIRP firepower, three beams and enough range for serious predator work from the bank or boat.
- 94 g ABS castable sonar with triple-beam CHIRP technology.
- Three frequencies: 100 kHz, 240 kHz and 675 kHz, with 47°, 20° and 7° beam angles.
- Maximum scanning depth is 100 m / 330 ft, with connectivity up to 120 m / 394 ft.
- USB-C charging gives up to 15 hours of battery life, with 80% charge in 45 minutes.
Quick verdict
Verdict
The Deeper CHIRP+ 3 is a cracking bit of kit if you want to understand what’s happening beneath a swim without lugging a full boat sonar around. Its three beams give you a useful balance of coverage, detail and target separation.
It’s not a magic fish-catching button, mind. You still need to read the water and put a bait in the right place. But for finding depth changes, locating features and checking likely predator areas, this is a very capable, dead-handy tool.
A high-value bit of portable sonar for anglers who’ll actually use the information it provides.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality
- 9.4/10
- Performance
- 9.7/10
- Impact on Fish Catching
- 9/10
- Ease of Use
- 8.6/10
- Value for Money
- 8.8/10
The compact ABS build, included accessories and well-equipped CHIRP system feel properly premium.
Three beams, a 100 m scanning depth and up to 15 scans per second give it impressive capability.
Better knowledge of depth, features and targets can make your predator fishing far more purposeful.
It’s compact and USB-C charging is simple, though you still need to cast it and interpret a connected display.
The feature set is strong for serious mobile anglers, but casual users may not get full value from it.
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 Smart Sonar (this one)
Top scorer
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 Smart Sonar
A castable fish finder can be a proper eye-opener when you’re predator fishing. Instead of guessing what’s under the float or lure, you can build a much clearer picture of depth, drop-offs and the bits of water that might actually be holding fish. That’s where the Deeper CHIRP+ 3 comes in, mate.
This is a small sonar unit that goes out on a cast, then sends its information back to a connected smart device. At just 94 g, it’s light enough to use without making your setup feel like you’ve tied a house brick to the end. That matters when you’re scanning several swims or checking a big bit of water.
The headline feature is triple-beam CHIRP sonar. You get a wide 47° beam, a more focused 20° beam and a tight 7° beam. In plain English, you can start broad, find something interesting, then zoom in and have a proper look. That’s a lot more useful than being stuck with one view of the lakebed.
The 100 kHz beam covers more water, while the 240 kHz and 675 kHz options move towards greater detail and precision. The narrow beam offers target separation down to 1 cm, which is a serious bit of information when you’re trying to work out whether a return is one object or several close together.
For predator work, that flexibility is the big draw. You might scan a whole bay with the wider beam, check a likely drop-off with the mid beam, then use the narrow beam to inspect a tight feature. It won’t tell you to chuck a lure at exactly 2:17pm, sadly, but it can make your watercraft a lot more deliberate.
The stated maximum scanning depth is 100 metres, or 330 feet. Most UK venues won’t trouble that figure, but the generous ceiling means you’re not buying a tool that only works in shallow margins. Connectivity reaches up to 120 metres, giving you useful freedom when you’re covering distance from the bank.
Battery life is rated at up to 15 hours, so it should comfortably cover a proper day session when managed sensibly. Charging is via USB-C, with 80% available after 45 minutes and a full charge after 75 minutes. That’s spot on for topping up between trips rather than waiting around all day.
The ABS enclosure keeps the unit compact and practical, while the box includes a neoprene pouch, two attachment bolts and a night-fishing cover. Those little extras are handy. The cover is especially welcome when you’re out late and don’t want a bright unit shining away like a lighthouse.
There are limits, of course. You need a connected smart device to view the sonar information, and you still have to interpret what you’re seeing. A screen full of marks won’t replace finding the fish, choosing the right lure or presenting it properly. Think of the CHIRP+ 3 as another set of eyes, not a shortcut to a PB.
Used sensibly, it can save time and cut down the guesswork. Scan first, understand the swim, then fish the promising water properly. For serious predator anglers, especially those moving between venues, that’s a powerful bit of help. For a quick chuck on a puddle you know like the back of your hand, it may be more gadget than necessity.
Specifications
The nuts and bolts
- Weight
- 94 g
- Dimensions
- 67 × 64 × 64 mm
- Sonar
- Triple-beam CHIRP
- Frequencies and beams
- 100 kHz / 47°, 240 kHz / 20°, 675 kHz / 7°
- Depth and connectivity
- Up to 100 m / 330 ft scanning depth; up to 120 m / 394 ft connectivity range
- Battery and charging
- Up to 15 hours; USB-C, 80% in 45 minutes and 100% in 75 minutes
Specs checked with Deeper, Oct 2026.
Spot a model or spec change?
Our take
The smart bit is choosing the right beam
The wide beam helps you scan more water, the mid beam gives a more focused picture, and the narrow 7° beam is the detail merchant. That last one offers target separation down to 1 cm, which is properly useful when you’re trying to pick individual returns apart.
For a predator angler, that means less random chucking and more deliberate fishing. Find the shelf, hole, weed edge or bait presence first, then work out how you want to fish it. Much better than lobbing about and hoping for a cheeky take.
The kit
Small sonar, serious information
The CHIRP+ 3 packs triple-beam sonar into a 67 × 64 × 64 mm ABS enclosure. The 94 g weight is a real bonus for casting and carrying, particularly when you’re already loaded up with rods, lure boxes and a brew.
Its three beam angles give you options. Scan wide with 47°, tighten things up with 20°, then use the 7° beam when you want proper precision. The narrow beam’s 1 cm target separation is the detail that makes this model stand out.
Worth knowing. The sonar can scan down to 100 m and connect over up to 120 m, but those are maximum stated figures. Conditions, deployment and the smart device you’re using all affect how useful the information is on a real venue.
On the bank
A strong tool for mobile predator anglers
This is best suited to anglers who move around and need to learn water quickly. Scan a new swim, check the depth, find a shelf or hole, then decide whether it deserves a proper spell with the lure or deadbait.
It’s also useful from a small boat or other compact setup where a fixed sonar display would be overkill. The USB-C charging, up-to-15-hour battery and included pouch keep the practical side nicely straightforward.
If you fish one small lake every week and know its features already, you may not use all that capability. Likewise, if you prefer a totally stripped-back approach, the connected smart-device side could feel like extra faff.
Quick answers
The bits anglers usually want to know
The CHIRP+ 3 uses 100 kHz, 240 kHz and 675 kHz frequencies. They’re paired with 47°, 20° and 7° beams, giving you a choice between coverage and detail rather than forcing one compromise view.
Charging is via USB-C. Deeper states 80% charge in 45 minutes and full charge in 75 minutes, while battery life is up to 15 hours. That’s plenty for most day trips, though cold weather and usage patterns can affect real-world endurance.
The operating temperature range is -20°C to 40°C. The box includes the sonar, USB wire, neoprene pouch, two attachment bolts, quick guide, safety regulations and a night-fishing cover.
On paper
Pros & cons
What we like
- Very light at 94 g, so it won’t turn every cast into hard work.
- Three beams let you switch between broad scanning and fine detail.
- Excellent stated depth, range and narrow-beam target separation.
- USB-C charging and a useful 15-hour battery life make it practical for long sessions.
Worth knowing
- You’ll need a compatible smart device to make sense of the sonar information.
- Casting and retrieving any sonar adds another job to your session, especially in snaggy water.
- The high-end feature set won’t be necessary for a short, familiar session on a small pond.
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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 maximum stated scanning depth is 100 metres, or 330 feet. Actual useful performance will always depend on water conditions, bottom make-up and how you deploy it.
02What do the three sonar beams do?
What do the three sonar beams do?
The 47° beam gives wider coverage, the 20° beam offers a more focused view, and the 7° beam is the precision option. The narrow beam has target separation down to 1 cm.
03How long does the battery last?
How long does the battery last?
Battery life is rated at up to 15 hours. USB-C charging takes the unit to 80% in 45 minutes and 100% in 75 minutes.
What anglers say
The word from the bank
Our read: verdict. The strongest reasons to choose it are very light at 94 g, so it won’t turn every cast into hard work. and three beams let you switch between broad scanning and fine detail.; the main trade-off is you’ll need a compatible smart device to make sense of the sonar information..
Our take on the feedback
Why it appeals
Checked Sept '26 — “Very light at 94 g, so it won’t turn every cast into hard work.”
Best fit
Checked Sept '26 — “Predator anglers searching unfamiliar venues: It helps you identify depth changes, holes, shelves and likely bait areas before committing to a swim.”
Worth knowing
Checked Sept '26 — “You’ll need a compatible smart device to make sense of 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 Smart Sonar
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Owner reports
Own this? Help the next angler.
Quick multiple-choice reports from people who say they own the Deeper CHIRP+ 3 Smart Sonar. Not verified purchases, and kept separate from our score.
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