Photos: Deeper · supplied retailer imagery
Tools · Sonar mounts · Our take
Deeper Flex Arm 2.0
Flex Arm 2.0
Got a compatible Deeper and a boat or kayak? This clamp-on arm keeps your sonar alongside while you explore. Proper handy for afloat sessions — rather less useful if you never leave the bank.
- 79 cm overall length and 640 g weight.
- Wave Rider mounting bracket allows up to 20 cm of wave-motion adjustment.
- No-drill G-clamp fits suitable mounting surfaces up to 70 mm thick.
- Box includes the flexible arm, G-clamp, Wave Rider mounting bracket and safety strap.
Make sure it’s the right one. This is the mounting accessory, not a fish finder. Listed compatibility includes Deeper 3.0, PRO and PRO+; Deeper START isn't compatible.
Tackle Index Score
Tackle Index score
Provisional design-based scores, not on-water test results; value assumes you already own a compatible Deeper and will use the mount regularly.
- Product Quality8.8/10
- Performance8.8/10
- Impact on Fish Catching7.2/10
- Ease of Use9/10
- Value for Money7.7/10
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Who it suits
Is it right for you?
Great for
- Boat and kayak anglers with a compatible Deeper. Lets you keep the sonar deployed alongside while slowly exploring, rather than stopping for another cast.
- Anglers avoiding permanent fittings. The removable G-clamp means no drilling, provided your craft has a suitable solid mounting point.
Maybe skip if
- Bank-only carp and coarse anglers. If casting your Deeper already covers the job, this arm doesn't add much to your sessions.
- Deeper START owners or anglers without a suitable clamp point. START isn't compatible, and a flexible arm can't make an unsuitable mounting surface safe.
The lowdown
Introducing the Deeper Flex Arm 2.0
Got a compatible Deeper and a boat or kayak? This clamp-on arm keeps your sonar alongside while you explore. Proper handy for afloat sessions — rather less useful if you never leave the bank.
- 79 cm overall length and 640 g weight.
- Wave Rider mounting bracket allows up to 20 cm of wave-motion adjustment.
- No-drill G-clamp fits suitable mounting surfaces up to 70 mm thick.
- Box includes the flexible arm, G-clamp, Wave Rider mounting bracket and safety strap.
Quick verdict
A tidy upgrade for Deeper owners fishing afloat
The Flex Arm 2.0 makes sense when you'd rather keep your compatible Deeper alongside the craft than repeatedly cast and retrieve it. Tool-free clamping, a flexible arm and the Wave Rider bracket tackle a genuine bit of boat-fishing faff.
We haven't tested it on the water, so this is a look at its design and intended use, not a durability verdict. Check your mounting spot first: it's a useful accessory for the right setup, but an unnecessary extra for most bank-only anglers.
Provisional design-based scores, not on-water test results; value assumes you already own a compatible Deeper and will use the mount regularly.
- Product Quality
- 8.8/10
- Performance
- 8.8/10
- Impact on Fish Catching
- 7.2/10
- Ease of Use
- 9/10
- Value for Money
- 7.7/10
The listed materials and complete mounting kit look well suited to the job, though long-term durability hasn't been tested by us.
Flexible positioning and wave-motion adjustment address the main needs of keeping a sonar unit alongside a craft.
It can make exploring easier, but any benefit to catches depends on your sonar interpretation and fishing decisions.
No-drill installation is appealing, provided you have a suitable clamp point and enough clearance.
Its usefulness is strongest for regular afloat users, while occasional trips make a dedicated mount harder to justify.
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 Flex Arm 2.0
If you've ever looked at your Deeper and thought it'd be dead handy to keep it beside the boat rather than keep chucking it out, that's the job here. The Deeper Flex Arm 2.0 is a mounting accessory for compatible sonar units, designed for boats, kayaks and float tubes. Nothing mystical. No promise of a PB before breakfast. Just a way to hold your sounder alongside while you get on with exploring the water. For the right angler, that could remove a fair bit of faff.
The important bit is separating the mount from the sonar. You're not buying a fish finder, a screen or an upgrade to what your Deeper can detect. You're buying the flexible arm, a G-clamp, the Wave Rider mounting bracket and a safety strap. Listed compatibility includes Deeper 3.0, PRO and PRO+, while Deeper START isn't compatible. If you've got another model, check that exact pairing before spending your quid. A mounting accessory is only a bargain if it actually fits the kit you've already got.
Installation is the big draw. The G-clamp fits suitable mounting surfaces up to 70 mm thick, and there's no drilling involved. That's appealing if you don't fancy putting holes in your craft or want a removable setup. But don't confuse a generous clamp opening with universal fit. You need a solid place for it to grip, with a shape that lets the clamp sit properly. A thin lip, awkward moulding or soft inflatable tube isn't automatically a suitable mounting point just because you can get the jaws around it.
At 79 cm overall, the arm gives you some reach to position the sonar beside the craft, rather than leaving it tucked against the hull. The flexible design is useful because boats and kayaks aren't all laid out the same. Seats, paddles, rod holders and landing nets all want their own bit of space. Before launching, think through where everything moves. A sonar mount that looks spot on ashore can become a nuisance if it sits right where your paddle passes or where you need to net a lively fish.
Then there's the Wave Rider bracket, which offers up to 20 cm of wave-motion adjustment. The idea is to let the sonar follow changes at the water's surface rather than holding it completely rigid while the craft moves. That's a sensible feature on an accessory intended for afloat use. It doesn't mean waves stop mattering, though, or that every reading will stay perfect whatever the conditions. Correct positioning still counts, and we haven't tested this arm on the water to judge how smoothly that movement works in practice.
For carp and coarse fishing, the useful bit is reconnaissance. Where boating and sonar use are allowed, a slow look along a depth change can help you understand the swim before settling on a spot. You might be checking how a shelf falls away or whether an apparently featureless area has a change worth investigating. The arm makes that process less dependent on repeated casts. It doesn't tell you that fish are on the munch, prove a patch is clean enough for your rig or replace careful thinking about presentation.
There's a practical trade-off, naturally. The mount weighs 640 g, so it's another noticeable item to pack and another attachment to manage on a small craft. Its stainless steel, aluminium and fibreglass-reinforced plastic construction sounds appropriate for the job, but that isn't the same as a proven long-term toughness claim. Use the supplied safety strap as instructed, check the clamp before heading out and keep the arm clear of obstacles. Don't treat the quoted 20 kg maximum supported load as permission to tow things or shrug off impacts.
So who should be interested? Mainly the angler who already owns a compatible Deeper, regularly fishes afloat and has a sensible place to attach it. That's where the Flex Arm 2.0 has a clear purpose. If you're always on the bank, casting out and retrieving your sonar might already suit you perfectly. No need to buy an accessory just because it looks clever, mate. This is about making an existing boat setup easier to use, not buying a shortcut from a blank to a brace.
Specifications
The nuts and bolts
- Overall length and weight
- 79 cm / 31 inches; 640 g
- Wave-motion adjustment
- Up to 20 cm / 8 inches
- Clamp opening
- Fits suitable mounting surfaces up to 70 mm thick
- Maximum supported load
- 20 kg / 44 lb
- Materials
- Stainless steel, aluminium and fibreglass-reinforced plastic
- Included
- Flexible arm, G-clamp, Wave Rider mounting bracket and safety strap
Specs checked with Deeper, Oct 2026.
Spot a model or spec change?
Our take
Buy it for the workflow, not extra sonar power
The benefit is how you deploy your existing sonar. It doesn't upgrade the sounder's fish detection or turn every mark into a catch.
Its strongest use is slow, deliberate exploring from a suitable craft: checking depth changes, following contours and getting a clearer picture before deciding where to fish.
The setup
Closer look: a removable home for your sonar
The system has three main jobs: the G-clamp anchors it to the craft, the flexible arm positions the sounder and the Wave Rider bracket provides movement at the water end. The supplied safety strap adds a backup when fitted correctly. It's a more purposeful arrangement than improvising a rigid pole and hoping for the best.
Work out the mounting position before you get afloat. You want the sonar deployed as its instructions require, with room for your paddle, rods and landing net. Follow the fitting instructions rather than guessing how far to bend the arm or how tightly to wind down the clamp. No drilling is handy; careful fitting still matters.
Worth knowing. The stated 20 kg maximum supported load isn't a collision rating or a towing allowance. A snagged, projecting arm can put force through both the clamp and your craft. Keep it clear of obstacles and secure or remove it for transport.
Your fishing
Who it suits: regular afloat explorers
This makes most sense if your Deeper regularly comes aboard. Keeping it alongside can make slow surveying more convenient, especially when you're following a contour rather than checking one isolated point. The information still needs interpreting: a promising depth change is somewhere to investigate, not an instruction to dump a load of bait.
Kayak and float-tube owners should be particularly fussy about fit and clearance. Space is precious, and the fact that the arm is designed for these craft doesn't mean every layout accepts the clamp directly. For occasional afloat trips, weigh the convenience against another purchase and another item in the tackle pile.
Worth knowing. Check fishery rules before planning a sonar-mapping trip. Permission to fish a water doesn't automatically include permission to launch a craft or use a fish finder.
Before you buy
FAQs in full: fit, fitting and movement
Which models fit? Deeper 3.0, PRO and PRO+ are listed as compatible. START isn't. Don't assume every Deeper has the same attachment arrangement; if your model isn't named here, confirm compatibility before ordering. The mount also doesn't change your sonar's existing connection or operating requirements.
Does it need drilling? No — the included G-clamp is the fixing method, with capacity for suitable surfaces up to 70 mm thick. Measure the actual spot you intend to use and look at its shape and strength, not just its thickness. Keep the craft maker's guidance in mind too.
How does it handle waves? The Wave Rider bracket allows up to 20 cm of wave-motion adjustment to help accommodate movement at the surface. That's useful design intent, not a hands-on claim that it'll maintain perfect sonar contact in every chop. Conditions, positioning and your craft's movement still play their part.
Worth knowing. This review is based on the mount's features and intended use. We haven't used it on the water, so clamp security, long-term wear and real-world wave handling remain untested by us.
On paper
Pros & cons
What we like
- Keeps a compatible Deeper alongside your craft without repeated casting.
- Clamps on without drilling permanent holes.
- Flexible positioning helps you find a workable spot beside the hull.
- Wave-motion adjustment adds useful movement at the sonar mount.
- Safety strap is included rather than left as another purchase.
Worth knowing
- Needs a solid, suitably shaped mounting point; not every kayak or float tube offers one.
- Adds 640 g and another projecting accessory to manage aboard.
- Not compatible with Deeper START, and offers little to bank-only anglers.
Want one?
Add it to your Wanted list or join a Group Buy — shops see anonymous totals only.
Your questions answered
What anglers want to know
The stuff you’d ask your mate on the next peg. Straight answers, no waffle.
01Which Deeper models does the Flex Arm 2.0 fit?
Which Deeper models does the Flex Arm 2.0 fit?
Listed compatibility includes Deeper 3.0, PRO and PRO+. It isn't compatible with Deeper START. For a model not listed here, confirm the fit before buying.
02Do you need to drill holes to install it?
Do you need to drill holes to install it?
No. The supplied G-clamp attaches to suitable mounting surfaces up to 70 mm thick. You still need a solid, appropriately shaped clamping point.
03What does the Wave Rider bracket do?
What does the Wave Rider bracket do?
It provides up to 20 cm of wave-motion adjustment, intended to help the sonar move with the water rather than remain rigidly fixed. That isn't a guarantee of uninterrupted readings in rough conditions.
What anglers say
The word from the bank
Our read: a tidy upgrade for deeper owners fishing afloat. The strongest reasons to choose it are keeps a compatible deeper alongside your craft without repeated casting. and clamps on without drilling permanent holes.; the main trade-off is needs a solid, suitably shaped mounting point; not every kayak or float tube offers one..
Our take on the feedback
Why it appeals
Checked Sept '26 — “Keeps a compatible Deeper alongside your craft without repeated casting.”
Best fit
Checked Sept '26 — “Boat and kayak anglers with a compatible Deeper: Lets you keep the sonar deployed alongside while slowly exploring, rather than stopping for another cast.”
Worth knowing
Checked Sept '26 — “Needs a solid, suitably shaped mounting point; not every kayak or float tube offers one.”
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 Flex Arm 2.0
No angler score yet — nobody's reviewed Deeper Flex Arm 2.0 here. Be the first and get the score started.
Owner reports
Own this? Help the next angler.
Quick multiple-choice reports from people who say they own the Deeper Flex Arm 2.0. Not verified purchases, and kept separate from our score.
No owner reports yet.
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