Photos: Deeper · supplied retailer imagery
Predator tools · Smart sonar · Our take
Deeper START Smart Sonar
Deeper START Smart Sonar
Small, light and proper simple to use, the Deeper START gives you a clearer idea of what’s happening under the surface without dragging a bulky echo sounder around the bank.
- Single-beam sonar with a 40° beam cone and 120 kHz frequency.
- Depth range from 0.5m to 50m, with up to 10 scans per second.
- Wireless Wi-Fi connection with a quoted range of up to 50m.
- 65g ABS unit with rechargeable battery offering up to six hours’ use.
Make sure it’s the right one. This review covers the black-and-orange Deeper START Smart Sonar, supplied with a barrel swivel and USB charging wire.
Tackle Index Score
Tackle Index score
A compact, useful sonar for anglers who want quick depth information without loads of kit.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality8.8/10
- Performance8.3/10
- Impact on Fish Catching8.8/10
- Ease of Use9.4/10
- Value for Money8.6/10
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Who it suits
Is it right for you?
Great for
- Mobile predator anglers. It’s light, quick to deploy and useful when you’re checking several swims or walking a new venue.
- Anglers learning a water. Depth information can help you understand channels, shelves and deeper areas before committing to a spot.
Maybe skip if
- Anglers wanting advanced structure detail. The single-beam design is more basic than the multi-beam systems aimed at detailed mapping.
- Anyone without a suitable phone or tablet. The sonar relies on a wireless smart-device connection for viewing the information.
The lowdown
Introducing the Deeper START Smart Sonar
Small, light and proper simple to use, the Deeper START gives you a clearer idea of what’s happening under the surface without dragging a bulky echo sounder around the bank.
- Single-beam sonar with a 40° beam cone and 120 kHz frequency.
- Depth range from 0.5m to 50m, with up to 10 scans per second.
- Wireless Wi-Fi connection with a quoted range of up to 50m.
- 65g ABS unit with rechargeable battery offering up to six hours’ use.
Quick verdict
A cracking little finder for finding depth and likely predator areas
The Deeper START is a neat bit of kit for anglers who want quick depth and fish-finding information from the bank, a boat or a bit of exploring. It’s light, wireless and refreshingly free from a tangle of cables.
It won’t replace a more advanced multi-beam unit if you need detailed structure mapping or serious boat-based sonar work. But for locating depth changes, checking swims and making smarter predator choices, it’s a bob-on tool.
A compact, useful sonar for anglers who want quick depth information without loads of kit.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality
- 8.8/10
- Performance
- 8.3/10
- Impact on Fish Catching
- 8.8/10
- Ease of Use
- 9.4/10
- Value for Money
- 8.6/10
The compact ABS body, rechargeable battery and tidy wireless design make it feel like a well-focused piece of tackle.
The 0.5–50m range and 10 scans per second give it plenty of practical scope, although single-beam scanning limits the detail.
Finding depth changes and likely holding areas can help you place predator rigs and lures with more purpose.
It’s light, wireless and simple to deploy, with no separate display or bank-side cable faff.
It offers useful venue-reading features in a tiny package, though anglers wanting detailed mapping may need to spend more.
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 START 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 START Smart Sonar
There are times on the predator bank when a bit of extra information can save you a load of faff. You’ve got a new lake, a broad canal or a big reservoir in front of you, and the obvious question is simple: what’s actually going on under the surface? The Deeper START Smart Sonar is built to give you a useful answer without turning your fishing into a full-on tech project.
This is a small wireless fish finder designed for casting from the bank, boat or wherever you need to get a look at the water. It links to a compatible phone or tablet over Wi-Fi, while the little black-and-orange unit floats out on the surface. For predator anglers, that means you can check depth and search likely areas before deciding whether to chuck a lure, bait or deadbait into the swim.
The START uses a single-beam sonar with a 40-degree cone and a 120 kHz frequency. In plain English, it’s looking down through a defined patch of water rather than trying to show you every inch of the lakebed at once. That keeps the unit simple, but it also means you’ll get better answers by casting around and comparing different spots.
Its depth range runs from 0.5 metres down to 50 metres. That covers the shallow margins where pike and perch might patrol, as well as the deeper water found on reservoirs and larger stillwaters. You can use it to check whether that tempting-looking area really is shallow, whether a shelf drops away, or whether the deeper line sits closer to the bank than expected.
The scan rate is up to 10 scans per second, so the sonar keeps updating as the START moves. Cast it out, retrieve it steadily and watch what changes. A few passes at different distances can give you a much better feel for the swim than staring at the surface and hoping there’s a lump lurking underneath.
For a roving predator session, the size is a big part of the attraction. The unit weighs just 65 grams and measures 60 × 65 × 65mm. That’s tiny enough to live in a side pocket of your tackle bag, rather than taking over the whole lot alongside lure boxes, traces, forceps and a landing net.
The wireless design also keeps things nice and tidy. There’s no long cable running back to a fixed screen and no bulky display unit to strap down. You’ll need your phone or tablet for the readout, of course, so keep it somewhere secure and preferably protected from the usual wet-bank nonsense. One slip in the margins and it’s a very expensive swim marker.
Battery life is rated at up to six hours, with a charging time of around 2.5 hours. That should cover a decent day session for many anglers, especially if you’re using the START for a venue check rather than leaving it scanning non-stop. Charge it before you head out and you won’t be caught short when the rods are finally on a likely-looking line.
There’s a quoted wireless range of up to 50 metres, giving you useful scope to search water away from the bank. That’s plenty for checking a castable area, working a lure swim or finding a deeper channel across a canal. The included barrel swivel helps with attaching the unit, while the USB wire handles charging.
The important thing is knowing what this little sonar is — and what it isn’t. It’s a practical aid for finding depth and reading a swim, not a magic button that tells you exactly where a PB pike is sitting. Used with sensible watercraft, lure choice and a bit of patience, though, it can help you stop fishing blind. That’s a proper advantage when the venue feels unfamiliar or the fish are being a bit cagey.
Specifications
The nuts and bolts
- Material
- ABS
- Weight and dimensions
- 65g; 60 × 65 × 65mm
- Sonar
- Single beam, 120 kHz, 40° cone
- Depth range
- 0.5–50m
- Connection and battery
- Wireless Wi-Fi; rechargeable 3.7V, 850mAh lithium-polymer battery; up to 6 hours
- In the box
- Deeper Fishfinder START, barrel swivel and USB wire
Specs checked with Deeper, Oct 2026.
Spot a model or spec change?
Our take
The useful bit is knowing what’s underneath
Predator fishing often comes down to putting a lure or bait where the food is, not just launching it into the biggest-looking swim. The START helps you build a better picture of depth and what’s going on below the surface.
Its single-beam sonar keeps things straightforward. You get a 40-degree cone, a depth range from very shallow water down to 50 metres, and wireless Wi-Fi connection to a compatible phone or tablet. That’s plenty for many canals, lakes, reservoirs and stillwaters where you’re trying to find a drop-off, shelf or deeper holding area.
At just 65g, it’s no drama to carry in a tackle bag. Clip it to your line with the barrel swivel, cast it out, then bring it back in while the app displays the scan. That makes it handy when you’re faced with a new venue, a big open bank or a swim where the depth isn’t obvious.
The 10 scans-per-second rate means the unit is continually reading as it moves. You can cast around, work different distances and compare areas rather than relying purely on guesswork. For predator anglers, that can help when deciding whether to fish a near margin, a channel, a gravelly-looking flat or a deeper hole.
The START is especially appealing if you fish light and mobile. There’s no dedicated screen to lug around and no fixed transducer mount to faff with. Your phone does the viewing, while the Deeper sits on the water. Keep the phone secure and dry, and the setup stays pleasantly simple.
There are limits, mind. This is a single-beam unit, so it doesn’t give the wider, more detailed picture you’d get from a pricier multi-beam finder. You’re reading what’s inside that cone, not scanning a massive underwater panorama. Smart casting and a bit of interpretation still matter.
The wireless range is up to 50 metres, which gives you useful room to search a swim. You can work close in or send it further out without being tied to the bank. Just remember that range figures are a maximum, not a promise in every real-world situation, so keep the phone positioned sensibly.
Battery life is quoted at up to six hours, with a 2.5-hour charge time. That’s enough for plenty of day sessions, stalking trips and venue checks. Charge it before heading out, rather than discovering halfway through a bite-time that the little orange-and-black bobber is having a nap.
The main appeal is simple: the Deeper START gives you information without making fishing feel like a military operation. It’s not trying to be a full-on boat console. It’s a compact aid for making better choices, finding depth and putting your predator gear in more likely water. For the money bracket, that’s a proper useful job.
What you’re buying
A compact sonar that keeps the setup simple
The Deeper START is an ABS fish finder measuring 60 × 65 × 65mm and weighing 65g. It uses single-beam sonar at 120 kHz, with a 40-degree cone and a scan rate of up to 10 scans per second. The unit connects to your phone or tablet wirelessly over Wi-Fi, so there’s no dedicated screen or cable trailing back to your feet.
Its 0.5–50m depth range is broad enough for shallow margins, canals, lakes and deep reservoirs. Cast it out, retrieve it and compare different lines. For predator work, that’s useful when you’re trying to find a drop-off, a channel or a deeper area where baitfish and predators may spend time.
Worth knowing. The START is a single-beam unit. It gives you information from its sonar cone, rather than the wider and more detailed picture offered by pricier multi-beam systems. Covering an area with several casts is the smart move.
Best on the bank
Ideal for mobile anglers and venue explorers
This makes most sense for predator anglers who like to move. If you’re lure fishing a canal, checking a new lake or looking for a productive line before settling down with deadbaits, the light weight and wireless operation are both dead handy. There’s very little kit to carry and not much setup to faff with.
It also suits anglers who want to understand a venue rather than chucking at random. A few casts can show how quickly the depth changes and whether a feature is close enough to fish properly. Pair that information with visible cover, weather, water colour and signs of bait, and your choices become a lot more informed.
It’s less suited to anyone chasing highly detailed underwater mapping or a full boat-fishing sonar experience. The single beam keeps the START approachable, but advanced users may want broader coverage and more detailed structure information.
Quick answers
The bits anglers usually want to know
The wireless connection is quoted at up to 50 metres. That gives you a useful working range for many bank sessions, though your phone position, surroundings and conditions can affect the practical distance.
Yes. The quoted depth range starts at 0.5 metres, so it can be useful for checking shallow margins as well as deeper water. A steady retrieve and several angles will give you a better picture than one quick cast.
Give the rechargeable battery a full charge before heading out. It’s rated for up to six hours and takes around 2.5 hours to charge. The operating temperature is listed as 0–40°C, so avoid leaving it baking in a hot car or exposed to freezing conditions for long periods.
On paper
Pros & cons
What we like
- Tiny and light enough for mobile predator fishing.
- Wireless setup keeps the bank tidy and avoids cable faff.
- Useful depth range for canals, lakes, reservoirs and stillwaters.
- Simple way to check swims and locate depth changes.
- Rechargeable battery avoids disposable cells.
Worth knowing
- Single-beam scanning gives less underwater detail than pricier multi-beam units.
- You need a compatible phone or tablet to view the information.
- Six hours’ maximum battery life means regular charging for long sessions.
- The small unit can be easy to misplace among tackle if you’re not organised.
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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 START scan?
How deep can the Deeper START scan?
Its quoted depth range is 0.5m to 50m, or roughly 1.6ft to 165ft.
02How does the Deeper START connect?
How does the Deeper START connect?
It connects wirelessly using Wi-Fi, with a quoted range of up to 50 metres.
03How long does the battery last?
How long does the battery last?
The rechargeable 3.7V, 850mAh lithium-polymer battery is rated for up to six hours, with a charging time of around 2.5 hours.
What anglers say
The word from the bank
Our read: a cracking little finder for finding depth and likely predator areas. The strongest reasons to choose it are tiny and light enough for mobile predator fishing. and wireless setup keeps the bank tidy and avoids cable faff.; the main trade-off is single-beam scanning gives less underwater detail than pricier multi-beam units..
Our take on the feedback
Why it appeals
Checked Sept '26 — “Tiny and light enough for mobile predator fishing.”
Best fit
Checked Sept '26 — “Mobile predator anglers: It’s light, quick to deploy and useful when you’re checking several swims or walking a new venue.”
Worth knowing
Checked Sept '26 — “Single-beam scanning gives less underwater detail than pricier multi-beam units.”
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 START 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 START Smart Sonar. Not verified purchases, and kept separate from our score.
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