Buy the fishfinder, not just the mount: Garmin vs Deeper decoded

Display

Winner: Product A

The Garmin Striker 5cv wins this category because it includes a dedicated 5-inch display, while the Deeper Flexible Arm 2.0 has no screen at all. Garmin’s screen gives you immediate, always-on sonar feedback without relying on a phone, which is a big advantage in bright UK summer conditions or wet winter sessions when touchscreen use can be awkward. The Deeper arm is only a mount, so display quality is entirely dependent on the separate Deeper unit and your phone or tablet. If you want a self-contained setup for reading structure on a canal, reservoir or estuary, Garmin is the clear winner.

Performance

Winner: Product A

The Striker 5cv is the actual sonar unit here, and it brings CHIRP Traditional sonar plus ClearVu scanning sonar, along with built-in GPS and Quickdraw Contours mapping. That means it can find fish, show bottom detail and build your own maps of swims, drops and features. The Deeper Flexible Arm 2.0 does not improve sonar performance by itself; it simply positions a compatible Deeper device in the water more effectively. For pike anglers probing weed edges, carp anglers mapping margins, or boat anglers working over deep pits, Garmin delivers far more capability per purchase.

Build quality and design

Winner: Product B

This is the one area where the Deeper Flexible Arm 2.0 has the edge, because it is purpose-built for flexible mounting on boats, belly boats and kayaks. At £58.99, it is a practical, specialised accessory designed for anglers who need adaptable positioning and a secure hold in awkward craft layouts. Garmin’s Striker 5cv is well-known and highly rated, but as a fishfinder unit it is bulkier and more permanent in nature, with the screen and transducer package needing proper installation. If your priority is a neat, adjustable mount that moves with your craft, Deeper takes this point.

Battery life

Winner: Product B, but only because it does not use power itself

The Deeper Flexible Arm 2.0 has no battery to drain, which makes it effectively unbeatable in this category as an accessory. The Garmin Striker 5cv requires power from your boat or a portable battery setup, so runtime depends on your chosen battery capacity and how you run the unit. In practical angling terms, Garmin can still be very efficient for day sessions, but it is not a zero-power solution. If you are belly-boating or kayak fishing and want to minimise electrical complexity, the Deeper arm is the simpler option, though the real battery conversation belongs to the sonar device it supports.

Price and value for money

Winner: Product A for complete functionality, Product B for budget access

At £424.34, the Garmin is expensive, but it is a full fishfinder package with GPS, sonar and mapping software included. The Deeper Flexible Arm 2.0 is only £58.99, which is £365.35 cheaper, but it is not a direct alternative to a fishfinder; it is an accessory. If you need a complete unit and want one purchase to cover fishfinding and mapping on UK waters, Garmin offers better value because it delivers a finished system. If you already own a compatible Deeper sonar and simply need a stronger, more flexible mounting solution, the Deeper arm is excellent value because it solves a real setup problem for very little money.

Features and functionality

Winner: Product A

Garmin dominates on features. The Striker 5cv includes CHIRP Traditional sonar, ClearVu scanning sonar, GPS and Quickdraw Contours mapping software, giving you a proper all-round fishing tool. That matters for UK anglers who fish varied venues: shallow club lakes for carp, snaggy river stretches for pike, or rocky shore marks for bass. The Deeper Flexible Arm 2.0 has one job only, which is to mount a compatible sonar device securely and flexibly. It is useful, but it does not add fishfinding intelligence, mapping or navigation.

Overall user experience

Winner: Product A

For most anglers searching this comparison, the Garmin Striker 5cv is the better buy because it is a complete, ready-to-fish package. You switch it on, read the screen and get immediate sonar and mapping benefits without needing to pair a phone or worry about mounting logistics. The Deeper Flexible Arm 2.0 is a good accessory, especially for kayak and belly-boat anglers who need a tidy, adaptable mount, but it only makes sense if you already own a compatible Deeper unit. If you are starting from scratch, Garmin gives you far more fishing capability, more independence on the water and a more satisfying all-in-one experience.

Overall summary: choose the Garmin Striker 5cv if you want an actual fishfinder with screen, sonar, GPS and mapping. Choose the Deeper Flexible Arm 2.0 only if you already own a compatible Deeper sonar and need a better mounting solution for boat, belly boat or kayak use. For most buyers, the Garmin is the definitive winner because it is the only product here that actually finds fish on its own.