10 Best Fish Finders 2025 in the UK

The Deeper Pro Smart Sonar is a portable and castable fish finder designed for versatile use on kayaks, boats, and shore fishing. It offers real-time sonar data with two beam frequencies that scan up to 100 meters from the shore and 80 meters deep underwater, providing detailed views of fish, bottom structure, and vegetation. Its high target separation of 2.5 cm enables it to distinguish closely spaced objects underwater, which helps with spotting individual fish.

A significant advantage is its integration with iOS and Android devices via WiFi, displaying sonar data on your phone or tablet in color for easy interpretation. It includes GPS mapping capabilities that allow you to create bathymetric maps and save important fishing spots, photos, and notes—valuable for tracking and planning future trips. Installation requires no drilling or cables, making setup hassle-free on various watercraft. The device is battery-powered and lightweight, enhancing its portability.

The device does not have a built-in display screen, relying entirely on your smartphone or tablet for visuals, which means you need a compatible device and the range may be limited by WiFi signal strength. It also lacks CHIRP technology, which some advanced fish finders use for clearer and more detailed sonar images. While it performs well in various fishing conditions and seasons, its power level and scan depth are modest compared to larger, boat-mounted models. This makes the Deeper Pro Smart Sonar an excellent option for casual anglers, kayak or shore fishermen who prioritize portability, ease of use, and smartphone integration, although it might not satisfy users seeking the most advanced sonar technology or standalone displays.

The Garmin STRIKER Plus 4 is a compact and user-friendly fish finder ideal for casual anglers and small boat users. Its 4.3-inch bright display is easy to read even in sunlight, making it practical for daytime fishing trips. The device uses a dual-beam transducer with Garmin’s CHIRP sonar technology, which provides clear underwater images and helps distinguish between fish and other objects, improving your chances of spotting fish accurately.

It features built-in GPS and Quickdraw Contours mapping software, allowing you to mark fishing spots, create custom maps with detailed 1-foot depth contours, and track your boat’s speed. This is useful for both beginners and more serious anglers who want to navigate and remember productive locations. The unit is rugged with an IPX7 water rating, meaning it can handle splashes and rain without trouble.

While the screen size is relatively small compared to higher-end models, which might limit how much detail you can see at once, this model offers good value with decent sonar clarity and GPS features, especially for small boat or kayak fishing. Those needing a larger screen or more advanced mapping capabilities may want to explore higher-tier options.