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Fish finders · Castable sonar · Our take
Deeper PRO+ Smart Sonar
Deeper PRO+ Smart Sonar
A castable wireless fish finder with GPS mapping, dual-beam sonar and enough range to poke about before you commit a rod.
- 65 mm diameter and 100 g weight, with an ABS construction.
- Dual-beam sonar: 290 kHz at 15° and 90 kHz at 55°.
- Depth range of 0.5–80 m, with up to 15 scans per second.
- Wireless Wi-Fi connection up to 100 m, with GPS mapping and a battery life of up to six hours.
Make sure it’s the right one. This review covers the black Deeper PRO+ Smart Sonar with a 65 mm body, 100 g weight and dual-beam wireless sonar.
Tackle Index Score
Tackle Index score
A clever, portable sonar with genuinely useful mapping features. It earns its keep when you fish varied or unfamiliar waters, though casual margin anglers may not get full value from it.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality9/10
- Performance9.2/10
- Impact on Fish Catching8.8/10
- Ease of Use8.4/10
- Value for Money8.5/10
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Who it suits
Is it right for you?
Great for
- Carp anglers fishing new lakes. It helps you find depth changes, bars, slopes and likely holding areas before you settle on a spot.
- Coarse anglers who like exploring a swim. The wider beam and quick scanning can give you a useful picture of what’s going on across the peg.
Maybe skip if
- Anglers who only fish familiar margins. If you already know every contour and mainly drop rigs close in, plenty of the clever stuff may go unused.
- Anyone wanting a completely hands-off gadget. You still need to cast it accurately, read the screen sensibly and make the fishing decisions yourself.
The lowdown
Introducing the Deeper PRO+ Smart Sonar
A castable wireless fish finder with GPS mapping, dual-beam sonar and enough range to poke about before you commit a rod.
- 65 mm diameter and 100 g weight, with an ABS construction.
- Dual-beam sonar: 290 kHz at 15° and 90 kHz at 55°.
- Depth range of 0.5–80 m, with up to 15 scans per second.
- Wireless Wi-Fi connection up to 100 m, with GPS mapping and a battery life of up to six hours.
Quick verdict
Verdict
The Deeper PRO+ is a cracking bit of kit for building a picture of a swim before you start chucking bait about. You can scan depths, spot changes in the bottom and save useful areas through the GPS mapping features.
It’s not a magic fish-catching button, and you’ll need a decent phone or tablet plus a bit of patience to read the returns properly. But for watercraft, feature finding and checking those awkward far-bank spots, it’s a proper handy tool.
A clever, portable sonar with genuinely useful mapping features. It earns its keep when you fish varied or unfamiliar waters, though casual margin anglers may not get full value from it.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality
- 9/10
- Performance
- 9.2/10
- Impact on Fish Catching
- 8.8/10
- Ease of Use
- 8.4/10
- Value for Money
- 8.5/10
The compact ABS body, rechargeable battery and tidy wireless design make it feel like a well-considered piece of kit.
Dual beams, fast scanning, a broad depth range and up to 100 metres of Wi-Fi range give it strong on-paper capability.
Finding contours and depth changes can put you on better water, although the sonar still needs sensible angling decisions around it.
Casting and connecting are straightforward in principle, but getting confident with sonar returns and mapping takes a bit of practice.
It offers a strong mix of sonar and GPS mapping, with the best value coming for anglers who regularly explore new or feature-rich venues.
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 PRO+ Smart 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 PRO+ Smart Sonar
Some bits of tackle are all about getting more bites. Others are about stopping you wasting half a day fishing the wrong bit of water. The Deeper PRO+ Smart Sonar sits firmly in that second camp, mate. It’s a castable fish finder that gives you a look beneath the surface before you start committing to a spot.
That’s a pretty big deal on unfamiliar waters. You can see whether the margin shelves away, whether there’s a handy bar at range or whether that lovely-looking area is actually a flat, featureless dinner plate. No more assuming the bottom drops off just because the far bank looks dramatic. Lakes can be sneaky like that.
The unit itself is small and neat. It’s 65 mm across and weighs 100 g, so it won’t turn a suitable spod or marker outfit into a proper arm-breaker. The black ABS body is built for being cast out and retrieved, and the wireless connection keeps things tidy. There’s no cable trailing back to the bank, which is exactly what you want when you’re covering water.
The clever bit is the dual-beam sonar. The narrower 15-degree beam runs at 290 kHz and is useful when you want a more focused look at what’s directly below the unit. The wider 55-degree beam runs at 90 kHz and covers more water. In plain English, you can switch between a close-up look and a broader sweep of the swim.
That makes it handy for more than simply asking, “How deep is it?” You’re looking for changes. A little hump. A crease in the bottom. A shelf where the depth alters. Perhaps a smoother patch beside a rougher area. These are the places where a rig can sit differently, bait can collect and a carp might feel comfortable. The sonar gives you clues; your watercraft decides what to do with them.
The depth range stretches from 0.5 to 80 metres, which is far more than most UK coarse anglers will need. The useful headline for us is the scan speed, with up to 15 scans per second. As you move the Deeper across a swim, that helps build a more useful picture instead of giving you one lonely depth reading and leaving you to fill in the blanks.
GPS is another big reason to look at the PRO+ rather than a basic castable sonar. With the right app setup, you can create maps and keep track of areas you’ve scanned. That’s dead handy if you fish a large gravel pit, return to the same venue through the seasons or want to remember where a contour sits after the marker float has been packed away.
Connection is handled over Wi-Fi, with a rated range of up to 100 metres. That’s enough to investigate a fair chunk of water from the bank, assuming your casting gear and conditions let you reach it. The unit’s rechargeable battery is rated for up to six hours, and a full charge takes around two hours. For a normal session, that’s useful. For a full-on lake survey, keep an eye on the battery.
There are a couple of catches, naturally. You’ll need a phone or tablet, and you’ll need to learn what the returns are actually telling you. A sonar screen can show depth and features, but it won’t make every blob a carp or turn a poor spot into a bite-time banker. Use it alongside bubbling, showing fish, wind and sensible rig placement, and the Deeper PRO+ becomes a proper smart bit of kit rather than an expensive toy.
Specifications
The nuts and bolts
- Diameter
- 65 mm (2.5 in)
- Weight
- 100 g (3.5 oz)
- Sonar
- Dual beam: 290 kHz at 15° and 90 kHz at 55°
- Depth range
- 0.5–80 m (2–260 ft)
- Connection
- Wireless Wi-Fi, up to 100 m (330 ft)
- Battery
- Rechargeable 3.7 V, 850 mAh lithium polymer; up to 6 hours
Specs checked with Deeper, Oct 2026.
Spot a model or spec change?
Our take
The real edge is finding the right water
A castable sonar won’t replace watching the water or understanding a lake. What it does is take some of the guesswork out of depth and feature finding, especially when you’re fishing a new venue or a swim with limited access.
The dual beam gives you a tighter view and a wider sweep, while GPS mapping lets you build something useful rather than relying on a few vague marker-float memories. That can make a big difference when the rods are out and you’re trying to put bait on the same bit of lakebed.
Closer look
A compact sonar that earns its place in the bag
The PRO+ is a small castable sonar with a 65 mm diameter and 100 g weight. It connects wirelessly to a phone or tablet over Wi-Fi, so you can scan without a cable running back to the bank. That makes it much less of a faff than setting up a full boat-style fish finder.
Its dual-beam setup is the main attraction. The 15-degree beam gives a tighter view at 290 kHz, while the 55-degree beam at 90 kHz covers a broader patch. Use the narrow view when you’re homing in on a likely feature, then the wider beam when you’re exploring a whole swim.
The depth range is 0.5–80 metres and the scan rate reaches up to 15 scans per second. For UK carp and coarse fishing, that gives you plenty of headroom. The built-in GPS receiver also supports mapping through the app, so you can save a useful picture of the lakebed instead of relying on memory.
Worth knowing. The power adapter isn’t included. Charging uses Micro USB-B at 5 V DC, with a maximum input of 450 mA. Give it a proper charge before heading off for a long session.
Who it suits
Best for anglers who like doing their homework
If you’re fishing a new venue, the PRO+ can help you decide where to put the effort. Scan a few likely areas, compare depths and look for changes rather than blindly clipping up to the far bank. It’s especially useful when the lake is too deep, wide or snaggy to comfortably investigate with a marker float.
Carp anglers can use it to build a picture before deciding between a margin spot, a mid-water bar or a far-side shelf. Match anglers and general coarse anglers may find the wider beam useful for checking the contours of a peg and understanding where fish could patrol.
It suits organised anglers too. Saving maps means you can return to the same water and compare what you found previously. That’s useful as weed changes, water levels move or fish switch from open-water areas to the margins.
Worth knowing. Don’t let the gadget overrule the lake. A perfect-looking contour is no guarantee of a bite if the wind, light, pressure or fish movement says otherwise. Treat the sonar as another clue in the puzzle.
FAQs in full
The stuff you’ll want to know before buying
Is it tough enough for regular bank work? The ABS construction and compact castable body make it suited to being used from the bank, but it still deserves sensible tackle care. Rinse off any muck, keep the charging port looked after and don’t leave it rattling around loose with leads and banksticks.
Does the 100-metre range mean you can always fish 100 metres out? Not automatically. The stated connection range is up to 100 metres, but the practical distance depends on your casting position, obstructions and the device receiving the Wi-Fi signal. Keep the phone or tablet where it has a clear connection.
Will it show individual carp perfectly? Sonar can provide useful returns, depth information and bottom detail, but interpreting fish signals takes practice. The real value is often finding the sort of water carp might favour, then combining that information with what you can see and what the conditions are doing.
Worth knowing. Its operating temperature is rated from -20°C to 40°C. In cold-weather fishing, battery performance can still be affected by how the unit is stored, so keep it protected between scans.
On paper
Pros & cons
What we like
- Castable design gives you a look at water that’s awkward to reach from the bank.
- Dual beam offers both a narrower detailed view and a wider sweep of the swim.
- GPS mapping can help you save depths, contours and productive-looking areas.
- Compact, light and simple to carry in a tackle bag.
Worth knowing
- You’ll need a compatible phone or tablet and the app to get the most from it.
- Six hours of battery life is useful, but big mapping missions may need a charge between sessions.
- Sonar returns take a little practice to interpret properly; it won’t tell you everything about a carp’s mood.
Want one?
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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 PRO+ map a lake?
Can the Deeper PRO+ map a lake?
Yes. Its built-in GPS receiver works with the Deeper app to create and save mapping information as you scan. That makes it useful for building a picture of contours and depths across a swim.
02How far can it connect to a phone?
How far can it connect to a phone?
The wireless Wi-Fi connection is rated up to 100 metres. Real-world range can vary with casting position, obstructions and the phone or tablet you’re using.
03How long does the battery last?
How long does the battery last?
Battery life is rated at up to six hours, with charging taking approximately two hours. It uses a Micro USB-B connection, and a power adapter isn’t included.
What anglers say
The word from the bank
Our read: verdict. The strongest reasons to choose it are castable design gives you a look at water that’s awkward to reach from the bank. and dual beam offers both a narrower detailed view and a wider sweep of the swim.; the main trade-off is you’ll need a compatible phone or tablet and the app to get the most from it..
Our take on the feedback
Why it appeals
Checked Sept '26 — “Castable design gives you a look at water that’s awkward to reach from the bank.”
Best fit
Checked Sept '26 — “Carp anglers fishing new lakes: It helps you find depth changes, bars, slopes and likely holding areas before you settle on a spot.”
Worth knowing
Checked Sept '26 — “You’ll need a compatible phone or tablet and the app to get the most from it.”
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 PRO+ 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 PRO+ Smart Sonar. Not verified purchases, and kept separate from our score.
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