Fish finders · Swim mapping · Our take
Deeper Smart Sonar PRO+ 2
PRO+ 2 castable smart sonar
A compact castable sonar for mapping depths, finding features and making sense of a new swim before you start piling in the bait.
- Three sonar frequencies with narrow, medium and wide beam options.
- Scans from 15 cm down to 100 m, with up to 15 scans per second.
- Built-in GNSS supports GPS, GLONASS, Galileo, BeiDou and QZSS.
- Up to nine hours’ operating time, with 80% charge in around 45 minutes.
Make sure it’s the right one. This review covers the Deeper Smart Sonar PRO+ 2, not the standard PRO or CHIRP+ models.
Tackle Index Score
Tackle Index score
A capable, feature-packed castable sonar that makes most sense for anglers who’ll use its mapping tools regularly.
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 Use8.5/10
- Value for Money8.6/10
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Who it suits
Is it right for you?
Great for
- Carp anglers exploring new venues. It helps you map depth changes, bars, plateaux and weed before setting the traps.
- Coarse and match anglers fishing unfamiliar pegs. The broad scanning options can quickly show the shape of the swim and likely feeding lines.
Maybe skip if
- Anglers who only fish tiny, familiar ponds. You may already know the water well enough that the extra gadget feels like overkill.
- Anyone wanting a completely hands-off answer. The sonar gives you information, but you still need to interpret the swim and make the angling decisions.
The lowdown
Introducing the Deeper Smart Sonar PRO+ 2
A compact castable sonar for mapping depths, finding features and making sense of a new swim before you start piling in the bait.
- Three sonar frequencies with narrow, medium and wide beam options.
- Scans from 15 cm down to 100 m, with up to 15 scans per second.
- Built-in GNSS supports GPS, GLONASS, Galileo, BeiDou and QZSS.
- Up to nine hours’ operating time, with 80% charge in around 45 minutes.
Quick verdict
Verdict
The Deeper Smart Sonar PRO+ 2 is a cracking bit of kit for anglers who want more than guesswork when they arrive at an unfamiliar lake. Cast it out, retrieve it steadily and you can build a much clearer picture of depth, drop-offs, weed and likely holding areas.
It won’t put a carp in the net on its own, and you’ll still need to read the water properly. But for mapping a swim, checking the margins and finding those little changes in depth, it’s a genuinely useful tool. Proper handy for mobile anglers and anyone who likes to fish with a plan.
A capable, feature-packed castable sonar that makes most sense for anglers who’ll use its mapping tools regularly.
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
- 8.5/10
- Value for Money
- 8.6/10
The ABS body, titanium inserts, compact build and included pouch point to a well-considered bit of tackle.
Three frequencies, useful beam choices, fast scanning and a broad depth range give it plenty of practical flexibility.
It can improve spot choice and reduce blind searching, although watercraft and fish movement still matter more than any screen.
The cast-and-retrieve concept is straightforward, but pairing, app use, charging and interpretation add a little faff.
It offers a strong feature set for regular explorers, while occasional anglers may struggle to justify the extra spend.
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 Smart Sonar PRO+ 2 (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 Smart Sonar PRO+ 2
Arriving at a new lake with no idea where the fish are sat can feel like fishing in the dark. You can plumb around, clip up and make educated guesses, of course. But sometimes the bottom is doing something sneaky just beyond the edge of the margins. That’s where the Deeper Smart Sonar PRO+ 2 comes in. It’s a compact castable fish finder aimed at anglers who want a proper look at what’s going on under the surface before the rods are fishing.
The basic idea is dead simple. Attach the sonar, cast it out and retrieve it at a steady pace while the connected app turns the readings into a picture of the swim. You’re looking for depth changes, shelves, weed, cleaner areas and bottom contours. It won’t whisper, “fish are here, mate,” but it can show you the sort of features carp and coarse fish often use when they’re on the munch.
There are three sonar frequencies to play with. The narrow 675 kHz beam has a 7° angle and is the focused option, useful when you’re trying to inspect a particular area. The medium 240 kHz beam opens things up to 20°, while the wide 100 kHz beam reaches 47°. That gives you a sensible spread of options, from picking over a tight target to searching a whole swim without endless casts.
That flexibility matters on the bank. A wide beam can help you get the gist of a new area quickly, especially when you’re trying to understand how a shelf runs away from the edge. Once you’ve found something interesting, the narrower beam can help you look more closely. It’s a bit like using a marker float, but with more information coming back each time you wind in.
The stated depth range runs from just 15 cm down to 100 m, so it covers everything from shallow margins to seriously deep water. Most carp and coarse anglers won’t be troubling the bottom end of that figure, naturally, but the useful bit is the broad operating range. Target separation is also designed to show small differences, with 1 cm on the narrow beam and 2.4 cm on the medium and wide settings.
For a mobile angler, the 90 g weight is a big plus. The body uses an ABS enclosure with titanium inserts, and it comes with two attachment bolts, a neoprene pouch and a USB cable. It’s not another massive box to drag round the lake. Keep the pouch handy, protect the unit between casts and you can add it to your kit without turning a quick overnighter into a removal job.
The built-in GNSS is another useful touch. It supports GPS, GLONASS, Galileo, BeiDou and QZSS, giving the unit positioning support for mapping and returning to areas you’ve already explored. That’s particularly handy when you find a cheeky little bar or a clean patch but don’t want to rely solely on a distant tree, aerator or reed bed as your marker.
Battery life is quoted at up to nine hours, depending on how you use it. That’s plenty for most sessions, and the charging figures are friendly too: around 80% in 45 minutes and full in roughly 75 minutes. Connection is via Wi-Fi, with a stated stable range up to 100 m. In practice, you’ll still want to keep your phone secure and avoid wandering off while staring at the screen.
There are limits, mind. A sonar reading is only as useful as the angler interpreting it. Weed, silt, debris and a rough bottom can all make the picture harder to understand, especially if you rush the retrieve. You also need to think about your setup and attachment point before launching it. Used sensibly, though, the PRO+ 2 is a proper useful bit of kit for turning a mystery swim into a plan.
Specifications
The nuts and bolts
- Construction
- ABS enclosure with titanium inserts
- Weight
- 90 g (3.2 oz)
- Sonar
- 675 kHz narrow, 240 kHz medium and 100 kHz wide
- Beam angles
- 7°, 20° and 47°
- Depth range
- 15 cm to 100 m
- Battery and runtime
- 3.7 V rechargeable 950 mAh lithium-ion; up to 9 hours
Specs checked with Deeper, Oct 2026.
Spot a model or spec change?
Our take
The smart angle
The big appeal here is control. Instead of lobbing three leads around and hoping the marker tells the whole story, the PRO+ 2 lets you scan a wider area and build a more complete picture. That can save time, reduce disturbance and help you choose a spot with a bit more confidence.
For coarse anglers, that means checking the depth across a match peg, finding a clean track through weed or seeing whether the margin shelves away sharply. For carp anglers, it’s about locating plateaux, bars and depth changes before committing the rods. It’s not magic, mate, but it can take a fair chunk of faff out of watercraft.
What you’re buying
A compact sonar with three ways to scan
The PRO+ 2 is a 90 g castable sonar with three frequencies and three beam angles. The narrow 7° setting is the focused one, the 20° medium beam is the everyday compromise and the broad 47° beam helps you search more water. That spread makes it useful for both detailed checking and fast swim mapping.
Its depth range is 15 cm to 100 m, while scanning can run at up to 15 scans per second. The built-in GNSS is handy for mapping and repeatable positioning, and the Wi-Fi connection has a stated stable range up to 100 m. The ABS enclosure and titanium inserts keep the package compact without making it feel like a dainty toy.
Worth knowing. The best results come from a steady retrieve and a bit of patience. Don’t belt it out, wind it back like a lure and instantly trust every bump on the screen. Scan in a couple of directions, compare the readings and use your normal watercraft as the final judge.
On the bank
Useful for finding the plan before the rods go out
Carp anglers can use it to check bars, plateaux, marginal shelves, weedbeds and cleaner areas. That can be especially useful on day-ticket waters where the obvious spots get hammered. Find a detail away from the crowd, mark it properly and you’ve got a more considered starting point rather than just lobbing at the same island everyone else is fishing.
Coarse and match anglers may get plenty from the wider beam when checking a new peg. It can show whether the near margin drops away, where a channel runs or whether there’s a shallow shelf for a line of loose feed. Just remember that fish move, particularly with weather, pressure and angling disturbance. A map is a starting point, not a guarantee of a bite-time.
It suits anglers who enjoy the technical side of fishing and don’t mind using a phone or tablet alongside the rods. If you prefer a very stripped-back approach, the extra charging, attachment and screen faff might feel a bit naff. For anyone who likes to arrive prepared, though, it can save a lot of blind plumbing.
The handy bits
Answers before you chuck it out
Is it only for deep water? No. It starts at 15 cm, so it can be used for shallow edges as well as deeper areas. The wide beam is useful for getting a broad impression, while the narrow beam helps when you want to focus on a particular feature.
How should you use it for carp? Scan the swim before committing to a spot. Look for depth changes, transitions and areas that differ from the surrounding bottom. Once you’ve identified a likely area, repeat the scan from another angle and consider how wind, light and angling pressure might affect fish location.
Does the battery cover a session? It’s rated for up to nine hours, depending on usage, which should cover most day sessions comfortably. Charging is relatively quick too, with 80% available in about 45 minutes and a full charge in about 75 minutes.
On paper
Pros & cons
What we like
- Three beam angles give you useful flexibility, from pinpoint work to broad searching.
- Built-in GNSS helps with repeatable mapping and finding your way back to productive areas.
- Lightweight 90 g body is easy to cast with suitable tackle.
- Long claimed operating time and quick top-up charging are handy for full sessions.
Worth knowing
- You’ll need a compatible phone or tablet and the app to get the useful visual information.
- A castable sonar still needs careful interpretation; weed, debris and bottom changes can confuse the picture.
- Adding another electronic gadget means another battery and another bit of kit to look after.
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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 Smart Sonar PRO+ 2 be used from the bank?
Can the Deeper Smart Sonar PRO+ 2 be used from the bank?
Yes. It’s designed as a castable sonar, so you can attach it securely, cast it out and retrieve it to scan the water in front of you. Use suitable tackle and avoid giving it more welly than your rod and attachment setup can safely handle.
02What can the three sonar beams be used for?
What can the three sonar beams be used for?
The 7° narrow beam is useful when you want more focused detail. The 20° medium beam is a balanced everyday option, while the 47° wide beam covers more water when you’re searching a swim. Switching between them helps build a better picture rather than relying on one view.
03How long does the battery last?
How long does the battery last?
The stated operating time is up to nine hours, depending on usage. It has a rechargeable 950 mAh lithium-ion battery, reaches 80% in around 45 minutes and is fully charged in around 75 minutes.
What anglers say
The word from the bank
Our read: verdict. The strongest reasons to choose it are three beam angles give you useful flexibility, from pinpoint work to broad searching. and built-in gnss helps with repeatable mapping and finding your way back to productive areas.; the main trade-off is you’ll need a compatible phone or tablet and the app to get the useful visual information..
Our take on the feedback
Why it appeals
Checked Sept '26 — “Three beam angles give you useful flexibility, from pinpoint work to broad searching.”
Best fit
Checked Sept '26 — “Carp anglers exploring new venues: It helps you map depth changes, bars, plateaux and weed before setting the traps.”
Worth knowing
Checked Sept '26 — “You’ll need a compatible phone or tablet and the app to get the useful visual 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 Smart Sonar PRO+ 2
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Owner reports
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