Photos: Deeper · supplied retailer imagery
Castable Sonar Buying Guide · Our take
Deeper Chirp+ 2 Smart Sonar
Standard Desert Sand edition (Deeper also sell a Limited Edition Yellow version and Long Range Kit)
Deeper's Chirp+ 2 pairs a 3-frequency CHIRP sonar with its own Wi-Fi link to the Fish Deeper app, aimed at anglers who want to scan swims, build bathymetric maps and check depth and temperature from the bank without a boat.
- 3 Frequency CHIRP: Narrow 675kHz (7°), Medium 240kHz (20°), Wide 100kHz (47°)
- Target separation of 1cm in Narrow CHIRP, 2.4cm in Medium and Wide CHIRP
- Depth range from 15cm down to 100m
- Wi-Fi connection stable up to 120m, paired with the free Fish Deeper app
Make sure it’s the right one. Deeper's current castable sonar is called the Chirp+ 2 (sometimes written CHIRP+2). Deeper also sell a Limited Edition Yellow version with a Night Fishing Cover included, and a Long Range Kit with an extended 200m Wi-Fi range; this review covers the standard Desert Sand CHIRP+ 2.
Tackle Index Score
Tackle Index score
A genuinely capable castable sonar with three beam frequencies and solid depth range, aimed at anglers who want to properly understand a swim rather than guess.
- Product Quality8.8/10
- Performance8.8/10
- Impact on Fish Catching7.7/10
- Ease of Use7.7/10
- Value for Money6.6/10
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Who it suits
Is it right for you?
Great for
- Anglers fishing large or unfamiliar waters. The wide beam and bathymetric mapping are built to help you find depth changes and features without a boat.
- Anglers who like to build a detailed picture of a swim over time. Maps and logged sessions in the Fish Deeper app can be revisited and built on from one trip to the next.
Maybe skip if
- Anglers who prefer a simple, low-tech approach. A marker float and feature-finder setup covers the basics without an app or charging routine.
- Anglers on a tight budget for extras. A castable sonar is a bigger outlay than most other bits of bankside kit.
The lowdown
Introducing the Deeper Chirp+ 2 Smart Sonar
Deeper's Chirp+ 2 pairs a 3-frequency CHIRP sonar with its own Wi-Fi link to the Fish Deeper app, aimed at anglers who want to scan swims, build bathymetric maps and check depth and temperature from the bank without a boat.
- 3 Frequency CHIRP: Narrow 675kHz (7°), Medium 240kHz (20°), Wide 100kHz (47°)
- Target separation of 1cm in Narrow CHIRP, 2.4cm in Medium and Wide CHIRP
- Depth range from 15cm down to 100m
- Wi-Fi connection stable up to 120m, paired with the free Fish Deeper app
Quick verdict
Three Beams and a Stable Link Built Around Bank Fishing
Deeper's headline spec is the 3-frequency CHIRP setup: a wide 100kHz beam at 47° for scanning an area quickly, a medium 240kHz beam at 20° for homing in on a likely-looking spot, and a narrow 675kHz beam at 7° for picking out fine detail once you've found it. Deeper quote a target separation down to 1cm on the narrow beam, which is built specifically for telling individual fish apart in a tight shoal or tracking a single lure precisely.
Depth range runs from as shallow as 15cm right out to 100m, and Deeper say surface clutter and noise are kept to a minimum so readings stay usable close to the bank as well as at range. A built-in temperature sensor, accurate to 0.2°C, adds another layer of swim information alongside the depth and bottom-hardness picture the sonar builds up.
A genuinely capable castable sonar with three beam frequencies and solid depth range, aimed at anglers who want to properly understand a swim rather than guess.
- Product Quality
- 8.8/10
- Performance
- 8.8/10
- Impact on Fish Catching
- 7.7/10
- Ease of Use
- 7.7/10
- Value for Money
- 6.6/10
A well-specified bit of kit from a brand with a long track record in castable sonar.
Three CHIRP frequencies and a stable 120m Wi-Fi link cover scanning through to fine detail.
It won't catch fish for you, but finding features and depth changes genuinely helps narrow down where to fish.
Simple enough to cast and pair, though it does rely on having a charged phone or tablet to hand.
A genuine investment compared with a marker float, so it suits anglers who'll get regular use 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.
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+ 2 Smart Sonar
Finding fish and reading a swim used to mean either years of watercraft built up through trial and error, or dragging a marker float around hoping to snag on something interesting. These days there's a proper bit of kit that can do a lot of that legwork for you, and Deeper's Chirp+ 2 is one of the names that keeps coming up when anglers talk about castable sonar. It's a little pot of tech you lob out on your rod like a small feeder, and it beams back a picture of what's going on underneath the surface straight to your phone.
The clever bit is that it's not just one sonar beam doing all the work. There are three separate frequencies packed into that little unit: a wide one for scanning a big area quickly to get a feel for the lakebed, a medium one for zooming in once you've spotted somewhere interesting, and a proper narrow beam for picking out fine detail, like telling individual fish apart in a tight group rather than just seeing one big blob on the screen. For anyone who's ever squinted at a basic fish finder and had no real idea what they were looking at, having that level of separation genuinely changes the game.
Depth range is another string to its bow. We're talking everything from dead shallow margins, just 15cm deep, right out to proper depths of 100 metres, so whether you're checking a shelf two rod lengths out or trying to work out what's happening in the depths of a big gravel pit or reservoir, it's got you covered. And because it's doing all this without needing you to be sat in a boat, it's opened up proper sonar tech to bank anglers in a way that just wasn't realistic before.
One thing that always used to put people off this kind of gadget was signal drop-out, nobody wants to cast out, lose the connection, and spend half the session faffing about trying to reconnect. Deeper have clearly had a good think about that, because the unit creates its own Wi-Fi signal rather than relying on your phone's data, and they reckon that connection stays solid up to 120 metres out. That's a proper decent chuck for most feeder or bait rods, and it means you're not fighting your phone signal bars on top of everything else.
Pair it all up with the Fish Deeper app and you start to see where the real long-term value is. It's not just a one-off snapshot of what's under your float, you can log sessions, build up your own maps of a venue over repeat visits, and genuinely start to understand a lake's features in a way that would otherwise take years of fishing it blind. For anglers who like to properly dissect a new water before committing to a swim, or who are forever chasing an edge on a well-known venue, that kind of building picture could be a real asset.
Battery life sits around the 15-hour mark with GPS switched off, dropping to roughly 9 hours if you've got the mapping features running, and Deeper's fast-charge tech means you're not stuck waiting around all day to top it back up, with 80% charge coming back in roughly an hour. A temperature sensor accurate to two tenths of a degree rounds out the sensor package, giving you yet another data point to chew over when you're trying to figure out why the fish are, or aren't, behaving the way you'd expect.
It's worth being upfront that this isn't a cheap bit of kit, and it's never going to replace genuine watercraft built up over years on the bank. It's also reliant on having a smartphone or tablet with you to actually see any of the data, so it's one more thing to keep charged and one more thing to keep dry. But for anglers who fish big or unfamiliar waters, who like the idea of building genuine knowledge of a venue rather than guessing, or who simply fancy having a proper play with some clever tech on the bank, the Chirp+ 2 offers a genuinely different way of approaching a swim. It's not a magic wand that catches fish for you, but as a tool for cutting down the guesswork, it's hard to argue with the thinking behind it.
Specifications
The nuts and bolts
- Sonar Type
- 3 Frequency CHIRP: Narrow 675kHz (7°), Medium 240kHz (20°), Wide 100kHz (47°)
- From the maker
- Target Separation
- 1cm Narrow CHIRP, 2.4cm Medium and Wide CHIRP
- From the maker
- Depth Range
- 15cm to 100m
- From the maker
- Scan Rate
- Up to 15 scans per second
- From the maker
- Connection
- Wi-Fi, stable up to 120m
- From the maker
- Battery
- Li-Ion 1300mAh; up to 15 hours (GPS off), up to 9 hours (GPS on)
- From the maker
- GNSS
- GPS, GLONASS, Galileo, BeiDou, QZSS
- From the maker
- Weight
- 90g
- From the maker
- In the Box
- CHIRP+ 2 Sonar, USB wire, neoprene pouch, attachment bolts x2, Night Fishing Cover
- From shop listing
Specs checked with Deeper, Oct 2026.
Spot a model or spec change?
Our take
A Wi-Fi Link Built for Casting Range, Not Just a Boat
Because the Chirp+ 2 generates its own Wi-Fi signal rather than relying on mobile data, Deeper say the connection stays stable up to 120m, enough for most shore-based casts with a bait or feeder rod and the supplied float attachment. That link feeds the Fish Deeper app in real time, letting you plan, log and review sessions, and build your own bathymetric maps of a swim over repeated casts.
Battery life is rated at up to 15 hours with GPS switched off, dropping to around 9 hours with GPS running, and Deeper's fast-charge tech gets it to 80% in around an hour. GNSS support spans GPS, GLONASS, Galileo, BeiDou and QZSS, which is what underpins the mapping features when GPS is switched on.
What you're actually buying
Three beams built for searching and then homing in
The Chirp+ 2 is built around three separate CHIRP beam frequencies, a wide 100kHz beam for scanning an area quickly, a medium 240kHz beam for narrowing down on a likely spot, and a narrow 675kHz beam for picking out fine detail once you've found it. Deeper quote a target separation as tight as 1cm on the narrow beam.
- Beams
- Wide 47°, Medium 20°, Narrow 7°
- Depth
- 15cm to 100m
- Connection
- Wi-Fi, up to 120m
- Battery
- Up to 15h (GPS off)
Worth knowing. Deeper also sell a Limited Edition Yellow version with a Night Fishing Cover included as standard, and a Long Range Kit with an extended 200m Wi-Fi connection.
Who it suits
Who should actually buy this
Great if you’re…
- Anglers fishing large or unfamiliar waters. The wide beam and mapping features are built to help find depth changes and features without a boat.
- Anglers who like building a picture of a swim over several sessions. Logged sessions and bathymetric maps in the Fish Deeper app can be revisited over time.
Maybe skip if you’re…
- Anglers who prefer a simple marker-float approach. A marker float and feature-finding still covers the basics without an app or charging routine.
FAQs in full
The questions anglers actually ask
Deeper's GNSS support spans GPS, GLONASS, Galileo, BeiDou and QZSS, which is what underpins the mapping features when GPS is switched on, at the cost of some battery life compared with running the sonar GPS-off.
A built-in temperature sensor, accurate to 0.2°C, adds another layer of swim information alongside the depth and bottom-hardness picture the sonar builds as you retrieve it.
On paper
Pros & cons
What we like
- Three CHIRP beam frequencies cover wide-area searching through to fine, close-up target separation.
- Depth range from 15cm to 100m suits everything from margins to deep pits and reservoirs.
- Own Wi-Fi link means no mobile signal is needed, with a stable range up to 120m.
- Fish Deeper app builds bathymetric maps you can revisit on future sessions.
Worth knowing
- A genuine investment compared with a simple marker float and feature-finding.
- Relies on a paired smartphone or tablet to display any of the sonar data.
- Casting range is tied to how far you can comfortably cast the lightweight unit on suitable tackle.
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.
01How far can you cast the Chirp+ 2 and keep a signal?
Deeper say the Wi-Fi link is stable up to 120m.
How far can you cast the Chirp+ 2 and keep a signal?
Deeper say the Wi-Fi link is stable up to 120m.
Deeper's own spec gives a stable connection range of up to 120m, generated by the unit's own Wi-Fi rather than mobile data, so coverage shouldn't depend on signal strength at the venue.
02How long does the battery last?
Up to 15 hours with GPS off, up to 9 hours with GPS on.
How long does the battery last?
Up to 15 hours with GPS off, up to 9 hours with GPS on.
Deeper quote up to 15 hours of use with GPS switched off, dropping to around 9 hours with GPS running, and a fast-charge system that gets the unit to 80% in about an hour.
03Do you need the Fish Deeper app to use it?
Yes, the sonar pairs with a smartphone or tablet running the free app.
Do you need the Fish Deeper app to use it?
Yes, the sonar pairs with a smartphone or tablet running the free app.
The Chirp+ 2 connects over its own Wi-Fi to the Fish Deeper app, which displays the sonar readings, depth, temperature and mapping features in real time on your device.
What anglers say
The word from the bank
Our read: three beams and a stable link built around bank fishing. The strongest reasons to choose it are three chirp beam frequencies cover wide-area searching through to fine, close-up target separation. and depth range from 15cm to 100m suits everything from margins to deep pits and reservoirs.; the main trade-off is a genuine investment compared with a simple marker float and feature-finding..
Our take on the feedback
Why it appeals
Checked Sept '26 — “Three CHIRP beam frequencies cover wide-area searching through to fine, close-up target separation.”
Best fit
Checked Sept '26 — “Anglers fishing large or unfamiliar waters: The wide beam and bathymetric mapping are built to help you find depth changes and features without a boat.”
Worth knowing
Checked Sept '26 — “A genuine investment compared with a simple marker float and feature-finding.”
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+ 2 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+ 2 Smart Sonar. Not verified purchases, and kept separate from our score.
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