Photos: Deeper · supplied retailer imagery
Fish finders · Swim mapping · Our take
Deeper CHIRP+ 2 Fish Finder
Desert Sand
A proper bit of clever kit for mapping a swim, finding depth changes and spotting what’s going on beneath the surface — all from your phone.
- 90 g castable fish finder with a rechargeable Li-Ion battery.
- 3-frequency CHIRP sonar, covering narrow, medium and wide beam options.
- Depth range from 15 cm to 100 m, with a scan rate of up to 15 scans per second.
- Wi-Fi connection with a stable range of up to 120 m, plus GPS for mapping swims.
Make sure it’s the right one. This review covers the Deeper CHIRP+ 2 Fish Finder in Desert Sand, with 3-frequency CHIRP sonar and built-in GPS.
Tackle Index Score
Tackle Index score
A high-end castable fish finder with genuinely useful sonar flexibility and mapping features.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality9.4/10
- Performance9.6/10
- 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 mapping unfamiliar venues. It helps you find depth changes, bars, channels, weed and other features before committing to a spot.
- Coarse anglers fishing larger lakes and reservoirs. The beam choices let you search water efficiently, then zoom in on promising areas with more detail.
Maybe skip if
- Anglers who prefer a simple marker lead approach. If you already enjoy plumbing around and don’t fancy phone-based kit, this may feel like unnecessary faff.
- Short, ultra-light margin sessions. For a quick drop-in beside the reeds, the CHIRP+ 2 can be more technology than you actually need.
The lowdown
Introducing the Deeper CHIRP+ 2 Fish Finder
A proper bit of clever kit for mapping a swim, finding depth changes and spotting what’s going on beneath the surface — all from your phone.
- 90 g castable fish finder with a rechargeable Li-Ion battery.
- 3-frequency CHIRP sonar, covering narrow, medium and wide beam options.
- Depth range from 15 cm to 100 m, with a scan rate of up to 15 scans per second.
- Wi-Fi connection with a stable range of up to 120 m, plus GPS for mapping swims.
Quick verdict
Verdict
The Deeper CHIRP+ 2 is a cracking little fish finder for anglers who want a proper look at the lakebed without lugging a boat, echo sounder and battery box around. It’s tiny, light and seriously capable for a castable sonar.
It won’t replace watercraft, and you’ll still need to interpret what the screen is telling you. But for mapping swims, checking depth and building a picture of a venue, it’s a very useful tool. Proper clever stuff, mate.
A high-end castable fish finder with genuinely useful sonar flexibility and mapping features.
Desk-research score from specs, price and fishing fit · How we score
- Product Quality
- 9.4/10
- Performance
- 9.6/10
- Impact on Fish Catching
- 8.8/10
- Ease of Use
- 8.4/10
- Value for Money
- 8.5/10
The compact build, ABS enclosure with titanium inserts and included pouch make it feel properly thought through for bank use.
Three CHIRP frequencies, up to 15 scans per second and a depth range up to 100 m give it strong capability.
It can reveal features and help you place rigs better, although it still relies on your watercraft and decision-making.
The cast-and-retrieve idea is straightforward, but reading sonar and managing a phone app takes a bit of practice.
It’s expensive next to a marker float, but the mapping, GPS and multi-beam flexibility justify the price for regular venue explorers.
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+ 2 Fish Finder (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 CHIRP+ 2 Fish Finder
The Deeper CHIRP+ 2 is one of those bits of kit that makes you stop and think, “Blimey, we’re a long way from plumbing up with a marker float.” This little Desert Sand unit turns your phone into a portable fish finder, giving you a proper look at what’s happening under the surface.
At just 90 g, it’s light enough to cast out without making your setup feel like you’ve tied a house brick to the end. That matters on a long mapping session. You can cover a few areas, have a nose around the margins and still get your rods out without a load of shoulder ache and moaning.
The clever bit is the 3-frequency CHIRP sonar. You’ve got a 675 kHz narrow beam with a 7-degree cone angle for detail, a 240 kHz medium beam at 20 degrees, and a 100 kHz wide beam at 47 degrees for covering more water. In plain English, you can search broadly, then get more precise when a spot starts looking tasty.
That flexibility is bob on for coarse and carp fishing. A wide beam can help you get a feel for a big area, while the narrow beam is useful when you’re trying to understand a shelf, a crease or a small bit of bottom. It’s not just about seeing a depth number and cracking on. It’s about building a picture of the swim.
Target separation goes down to 1 cm with the narrow beam, while the medium and wide beams offer 2.4 cm. That gives the unit a good level of detail for a compact castable sonar. You’ll still need to read the screen sensibly, mind. Weed, debris and bottom changes can all make things look busy.
The depth range runs from 15 cm to 100 m, so it covers everything from shallow margin work to serious reservoir chucking. Most UK carp and coarse anglers won’t be anywhere near the deep end of that range, but it’s handy knowing the unit has plenty of headroom when you’re faced with a big, unfamiliar venue.
The built-in GPS is another big plus. You can map swims and log useful areas rather than relying on a vague memory of “somewhere over there, near that tree”. Over a few visits, that can become genuinely valuable. You might spot a route into a deeper channel, a plateau or a clear patch worth presenting a rig on.
Connection is handled over Wi-Fi, with a stable range of up to 120 m. That gives you room to work without standing right on top of the receiver. The scan rate can reach 15 scans per second, which should help keep the display responsive as the sonar moves across the swim.
Battery life is up to 9 hours with GPS running and up to 15 hours with GPS switched off. That’s plenty for most day sessions, although it’s still wise to arrive with it charged. The temperature sensor is accurate to 0.2°C too, which can be useful when you’re watching seasonal changes and trying to understand where the fish may be happiest.
In the box, you get the CHIRP+ 2 sonar, USB wire, neoprene pouch, two attachment bolts, a quick guide, safety information and a night fishing cover. The pouch is dead handy for keeping the unit protected between casts, while the cover is a nice touch for anyone doing a bit of bite-time reconnaissance. Overall, this is proper capable kit — just make sure you use the information rather than letting the gadget do all the fishing for you.
Specifications
The nuts and bolts
- Weight
- 90 g / 0.2 lb
- Sonar
- 3-frequency CHIRP
- Beam options
- 675 kHz narrow, 240 kHz medium and 100 kHz wide
- Depth range
- 15 cm to 100 m
- Battery life
- Up to 9 hours with GPS on, or up to 15 hours with GPS off
- Connection
- Wi-Fi, stable range up to 120 m
Specs checked with Deeper, Oct 2026.
Spot a model or spec change?
Our take
The big angle
This is best thought of as a swim-finding and lake-mapping tool rather than a magic fish-catching button. Chuck it around a swim, retrieve it steadily and the app can help show depth, bottom contours, weed and likely features.
The 3-frequency CHIRP setup is the headline act. You get a narrow beam for detail, a wider beam for covering more water and a middle option sitting between the two. That gives you more ways to read a swim, whether you’re checking a margin shelf or searching a big open area.
What you’re buying
Small package, serious sonar
The CHIRP+ 2 is a castable sonar unit that sends readings to your phone over Wi-Fi. Its ABS enclosure has titanium inserts, and the 90 g weight keeps it nicely manageable on the bank. You cast it out, retrieve it at a steady pace and watch the water beneath the float-shaped unit develop on screen.
The three beams are the main reason this is more versatile than a basic depth checker. Use the wide 100 kHz beam to search, the medium 240 kHz beam for a balanced view, or the narrow 675 kHz beam when you want to inspect a feature more closely. The narrow beam also gives the best target separation.
Worth knowing. A fish finder won’t choose the right rig, bait or spot for you. Use it alongside plumbing, observation and sensible watercraft. The best edge comes from combining the readings with what the lake is telling you.
Best on the bank
A handy edge for feature hunters
This is a strong fit for anglers fishing unfamiliar lakes, reservoirs and gravel pits. Before clipping up, you can check depths, search for transitions and work out how the bottom changes at different distances. That can save a fair bit of blind chucking and faff.
For carp anglers, it’s useful when you’re trying to find a clear spot, a marginal shelf or a route through weed. For coarse anglers, it can help make sense of a large area and locate depth changes where shoals may pass. The GPS mapping side is especially useful if you fish the same venue regularly.
Worth knowing. Retrieve speed matters. Go too fast and the display may give you less time to interpret changes; go steadily and compare several passes. Mark promising areas, then use your rig and lead to confirm what’s really down there.
The questions anglers ask
Getting the most from the CHIRP+ 2
Does it work in shallow water? Yes. Its stated depth range starts at 15 cm, making it suitable for checking shallow margins as well as deeper water. Just remember that very shallow, weedy or snaggy areas need careful casting and retrieval.
Is the wide beam always best? Not necessarily. Wide gives you more coverage, but a narrow beam can provide a cleaner, more detailed look at a particular feature. Start wide when searching, then switch to narrow when you’ve found something worth investigating.
Worth knowing. Keep the sonar charged and protect it in the supplied neoprene pouch between uses. If you’re mapping for hours, GPS-off running time is longer, but you’ll lose the benefit of location-based mapping.
On paper
Pros & cons
What we like
- Very light at 90 g, so it’s easy to cast and retrieve without turning the session into hard graft.
- Three sonar frequencies give you useful flexibility for detail, coverage and feature finding.
- Built-in GPS and mapping capability can help you build a proper picture of a venue over time.
- Up to 15 hours’ use with GPS switched off is plenty for most day sessions.
Worth knowing
- You need a compatible phone and the app running, so it adds another bit of kit to manage on the bank.
- The best results come from a steady retrieve and a bit of practice reading the display.
- It’s a serious investment compared with a basic marker float and lead setup.
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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 CHIRP+ 2 find fish?
Can the Deeper CHIRP+ 2 find fish?
It can show sonar returns that may represent fish, but don’t expect a guaranteed fish icon to do all the thinking for you. Learn to read the display alongside depth, bottom hardness and features.
02How do you use it for carp fishing?
How do you use it for carp fishing?
Cast it around the swim, retrieve it steadily and compare the readings from different areas. Use the narrow beam when you want more detail, and save useful maps or depth information so you can return to productive-looking features.
03How long does the battery last?
How long does the battery last?
Up to 9 hours with GPS switched on, or up to 15 hours with GPS switched off. Cold weather, connection use and how you fish can affect real-world running time.
What anglers say
The word from the bank
Our read: verdict. The strongest reasons to choose it are very light at 90 g, so it’s easy to cast and retrieve without turning the session into hard graft. and three sonar frequencies give you useful flexibility for detail, coverage and feature finding.; the main trade-off is you need a compatible phone and the app running, so it adds another bit of kit to manage on the bank..
Our take on the feedback
Why it appeals
Checked Sept '26 — “Very light at 90 g, so it’s easy to cast and retrieve without turning the session into hard graft.”
Best fit
Checked Sept '26 — “Carp anglers mapping unfamiliar venues: It helps you find depth changes, bars, channels, weed and other features before committing to a spot.”
Worth knowing
Checked Sept '26 — “You need a compatible phone and the app running, so it adds another bit of kit to manage on the bank.”
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 Fish Finder
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