The Ultimate Guide of Fishfinder

The Ultimate Guide of Fishfinder

The Ultimate Tool for Anglers and Marine Enthusiasts

Whether you’re a seasoned angler, a commercial fisher, or simply passionate about exploring the depths of the ocean, a fishfinder is an essential device that can revolutionize your underwater experience. By employing advanced sonar technology, fishfinders provide users with precise information on fish location, water depth, and underwater terrain.

Locating Fish Made Easy

One of the primary benefits of a fishfinder is its ability to accurately locate fish in the water. By analyzing the returning sound waves, the device can distinguish between fish and other underwater structures. This allows anglers and commercial fishers to target their efforts more effectively, increasing their chances of a successful catch.

Determining Water Depth

In addition to locating fish, a fishfinder is also an invaluable tool when it comes to determining water depth. This information not only helps users avoid potential hazards but also allows them to tailor their fishing techniques to the specific depth of the water, further enhancing their chances of success.

Unraveling the Underwater Terrain

Understanding the underwater terrain is crucial for both navigation and successful fishing. A fishfinder’s sonar capabilities enable users to identify underwater structures such as rocks, vegetation, and even shipwrecks. This information can help users identify potential fishing hotspots and navigate more safely through unfamiliar waters.

A Deep Dive into the Science Behind Fishfinders: Sonar Technology and its Applications

Fishfinders, also known as depth sounders or echo sounders, have revolutionized the world of angling and marine exploration by providing a real-time glimpse of the underwater world. At the heart of these devices lies the powerful and fascinating technology of sonar (short for Sound Navigation and Ranging). In this part of the article, we’ll explore the fundamentals of sonar technology, how it works in a fishfinder, and its applications in various fields.

Sound Waves: The Foundation of Sonar Technology

To understand how a fishfinder works, we must first understand the basic principles of sound waves. Sound waves are essentially vibrations that travel through a medium, such as air or water. In the case of a fishfinder, the medium is water. When these waves encounter an object, they bounce back, creating what is known as an echo.

Sonar technology leverages these echoes to create a precise and detailed image of the underwater environment. This is achieved through the emission of sound waves (usually in the form of ultrasonic pulses) and the subsequent interpretation of the echoes that return to the device.

How a Fishfinder Works

A fishfinder consists of two primary components: a transducer and a display screen. The transducer is responsible for emitting sound waves and receiving the returning echoes, while the display screen presents a visual representation of the underwater environment.

  • Emitting Sound Waves: The transducer sends out a series of ultrasonic pulses, which travel through the water. The frequency of these pulses is crucial, as it determines the level of detail and the depth range. Higher frequencies deliver finer detail but have a limited depth range, while lower frequencies provide broader coverage but less detail.
  • Receiving Echoes: As the sound waves encounter underwater objects, such as fish, rocks, or the seabed, they bounce back as echoes. The time it takes for these echoes to return to the transducer provides information about the distance between the device and the objects.
  • Processing and Display: The fishfinder processes the received echoes, translating the data into a visual representation on the display screen. This may appear as a series of arches representing fish, or a more detailed image of the underwater landscape when using advanced imaging technologies such as CHIRP or side-scan sonar.

Applications of Sonar Technology Beyond Fishfinders

While fishfinders have popularized the use of sonar technology, their applications extend far beyond angling and marine exploration. Some of these include:

  • Marine Navigation: Sonar systems are employed in ships to detect obstacles and measure water depth, enhancing safe navigation.
  • Oceanography: Sonar technology contributes to our understanding of ocean currents, underwater topography, and the distribution of marine life.
  • Search and Rescue: Side-scan sonar systems are instrumental in locating underwater wreckage, sunken vessels, and missing persons.
  • Military and Security: Sonar systems are employed in submarines and surface vessels for detecting enemy vessels, mines, and other underwater threats.

Components of fishfinder

One of the most critical components of a fishfinder is the display screen. The display screen is the primary interface where users can view the underwater information, including fish depth, location, and size, as well as the overall topography. Modern fishfinders come with various screen sizes, resolutions, and display types, such as LED, LCD, and touchscreen. The choice of display will depend on the user’s preferences and the specific fishing conditions.

The transducer is another critical component of a fishfinder. The transducer is responsible for sending out and receiving sound waves. It converts electrical signals into sound waves, which are then emitted underwater and bounce off objects, returning as echoes. The transducer then converts these echoes back into electrical signals, which are processed and displayed on the screen. The quality of the transducer will significantly affect the accuracy and detail of the information displayed on the screen.

A fishfinder typically requires a 12-volt DC power source, which can be supplied by a boat’s battery or a portable battery pack. The power source is necessary to power the display screen, transducer, and other components of the fishfinder.

Fishfinders can be mounted in various ways, including on the hull, through the hull, or on a portable mount. The choice of mounting depends on factors like the type of boat, fishing conditions, and user preferences. Hull-mounted fishfinders are the most common, as they provide the most accurate readings and are the least intrusive.

Many fishfinders come equipped with built-in GPS and mapping capabilities, allowing users to navigate and save waypoints, track their routes, and even create custom maps of the underwater terrain. The GPS and mapping features make it easier for anglers to find and navigate to their preferred fishing spots, and to mark locations where they have had success in the past.

Benefits of using a fishfinder

  1. Improved fishing success: Fishfinders help anglers to identify productive fishing spots and avoid unproductive areas, increasing the chances of a successful catch.
  2. Time-saving: By quickly identifying fish locations and underwater structures, fishfinders save time that would otherwise be spent searching for fish manually.
  3. Enhanced navigation: Fishfinders equipped with GPS and mapping features can help users navigate unfamiliar waters, track their routes, and mark waypoints for future reference.
  4. Safety: Fishfinders can help users avoid underwater hazards, such as rocks, reefs, and submerged objects, ensuring a safer boating experience.

How to Choose a Fishfinder

When it comes to improving your fishing game, a fishfinder can be an invaluable tool to locate fish and understand underwater structures. With numerous models and features available, it can be challenging to select the perfect fishfinder for your needs. This ultimate guide will walk you through the essential factors to consider when choosing a fishfinder, ensuring you make the right choice for your fishing adventures.

  1. Determine your budget:
    Fishfinders come in a wide range of prices, from affordable entry-level models to high-end options. Set a budget before you start shopping, as this will help you focus on models within your price range and avoid overspending.
  2. Choose between standalone, combo, or networked units:
    Standalone units are dedicated fishfinders that perform well for anglers who only need sonar capabilities. Combo units combine a fishfinder with a GPS system and are ideal for those who require navigational assistance. Networked systems offer advanced features, including radar, video, and Bluetooth connectivity, making them suitable for serious anglers.
  3. Understand the types of sonar:
    There are two main types of sonar technology used in fishfinders: CHIRP (Compressed High-Intensity Radiated Pulse) and traditional sonar. CHIRP offers more detailed and accurate imaging, while traditional sonar is more affordable. Determine which type of sonar best suits your needs based on your fishing style, environment, and budget.
  4. Consider the display size and resolution:
    The display size and resolution of your fishfinder will significantly impact your ability to read and interpret its data. Larger displays with higher resolutions offer clearer images, but may be more expensive and consume more power. Choose a display size and resolution that balances readability, cost, and energy efficiency.
  5. Evaluate transducer compatibility:
    The transducer is the component that sends and receives sonar signals, making it a crucial factor in your fishfinder’s performance. Ensure the fishfinder you choose is compatible with your boat’s existing transducer, or be prepared to purchase and install a new one that meets your needs.
  6. Assess GPS functionality:
    If you opt for a fishfinder with GPS, consider the quality of the GPS system, as this will impact your navigational abilities. Look for a model with a high-quality built-in GPS antenna, or consider an external antenna for enhanced reception.
  7. Check for additional features:
    Fishfinders can come with various extra features, such as side-scanning capability, down-imaging, and Wi-Fi connectivity. While these features can enhance your fishing experience, they may also increase the price of the unit. Determine which features are essential for your needs and select a fishfinder that offers them within your budget.


Choosing the right fishfinder can significantly enhance your fishing game and overall experience on the water. By considering factors such as budget, type of unit, sonar technology, display size and resolution, transducer compatibility, GPS functionality, and additional features, you can select the perfect fishfinder for your needs.

The best fishfinder

The Garmin Striker Plus 4

The Garmin Striker Plus 4

The Garmin Striker Plus 4 with Dual-Beam Transducer, 010-01870-00 – a powerful, versatile, and user-friendly fishfinder designed to elevate your angling experience to new heights. Boasting an array of advanced features and capabilities, this device is a valuable addition to any fishing vessel, whether you’re a weekend warrior or a seasoned professional.

Key Features

  1. High-resolution 4.3-inch display: The Garmin Striker Plus 4 features a bright, sunlight-readable 4.3-inch display with an intuitive user interface, making it easy to see and interpret the valuable information provided by the device.
  2. Dual-beam transducer: The included dual-beam transducer offers both 77/200 kHz frequency capabilities, providing you with a detailed view of the underwater environment. This advanced technology allows you to cover a wider area while maintaining excellent target separation and image clarity.
  3. Built-in GPS: With a high-sensitivity GPS receiver, the Striker Plus 4 lets you mark waypoints, create routes, and track your vessel’s speed. This invaluable feature helps you navigate with confidence and locate your favorite fishing spots with ease.
  4. Quickdraw Contours mapping software: Create your own custom HD fishing maps on the fly with the built-in Quickdraw Contours mapping software. No additional equipment or subscriptions are required; simply fish while the software records and stores up to 2 million acres of detailed contour maps.
  5. CHIRP Sonar technology: The Garmin Striker Plus 4 utilizes CHIRP Sonar technology, which sends a continuous sweep of frequencies to provide a more detailed, higher-resolution image of fish, structure, and the bottom. This innovative feature allows you to see and identify targets at greater depths.
  6. Rugged design and easy installation: Built to withstand the harshest marine environments, the Striker Plus 4 features a rugged, water-resistant design and an easy-to-install tilt/swivel mount. This ensures that your fishfinder remains secure and functional, even in rough conditions.
  7. NMEA 0183 support: For added connectivity, the Striker Plus 4 is compatible with the NMEA 0183 standard, allowing you to share data with other compatible devices on your boat.


  1. Clear and Bright Display: The Garmin Striker Plus 4 features a 4.3-inch color display with a 480 x 272-pixel resolution. The screen is bright and easy to read, even under direct sunlight, making it ideal for use on the water.
  2. Dual-Beam Transducer: The included dual-beam transducer provides excellent target separation and depth performance. It covers both 77 kHz and 200 kHz frequencies, allowing for a more detailed view of the underwater environment and better fish detection.
  3. GPS Capability: The built-in GPS allows you to mark waypoints, create routes, and track your boat’s speed. This can be helpful for navigating to productive fishing spots and returning to your favorite locations.
  4. Quickdraw Contours Mapping Software: The Garmin Striker Plus 4 is equipped with Quickdraw Contours software, which enables you to create personalized fishing maps with 1-foot contour lines in real-time. This can be especially helpful when fishing in unfamiliar waters.
  5. Rugged and Waterproof Design: The device is built with a rugged, waterproof design (rated IPX7), ensuring that it can withstand harsh fishing environments and wet conditions.
  6. Easy to Install and Use: The Garmin Striker Plus 4 is designed for easy installation and use, with intuitive menus and a user-friendly interface.


  1. Limited Screen Size: The 4.3-inch screen may be too small for some users, particularly those who prefer a larger display for easier readability and more on-screen information.
  2. No Nautical Charts: The Striker Plus 4 does not come with preloaded nautical charts, which can be a downside for those who require detailed navigational information.
  3. No Networking Capability: The device lacks networking capabilities, which means it cannot be integrated with other marine electronics, such as radar or autopilot systems.
  4. Limited Battery Life: Some users have reported that the battery life is not as long-lasting as they would like, which can be inconvenient during extended fishing trips.

The Humminbird, Helix 7

The Humminbird, Helix 7

The Humminbird Helix 7 is a high-performance fishfinder and GPS combo unit designed to help anglers of all skill levels locate and identify fish, navigate unfamiliar waters, and ultimately improve their overall fishing experience. With its 7-inch HD color display, advanced sonar technology, and user-friendly interface, the Helix 7 is an excellent tool for both casual and professional anglers alike.

Key Features

  1. 7-inch HD Color Display: The Helix 7 features a 7-inch, 800H x 480V pixel resolution, 16:9 widescreen display with LED backlighting that provides bright, clear, and easy-to-read images even in direct sunlight.
  2. Dual Spectrum CHIRP Sonar: The Helix 7 is equipped with Dual Spectrum CHIRP sonar, which delivers superior target separation, better clarity, and improved bottom contours. This technology enables you to see fish and structures with unmatched detail, making it easier to identify potential hotspots.
  3. GPS & Chartplotting: The built-in GPS receiver and chartplotter capabilities of the Helix 7 allow you to track your location, mark waypoints, and plan routes. With access to Humminbird’s extensive library of cartography options, including LakeMaster and CoastMaster, you can easily navigate unfamiliar waters with confidence.
  4. Networking & Expandability: The Helix 7 is compatible with a wide range of Humminbird accessories, including the 360 Imaging, AutoChart Live, and SmartStrike mapping system. With its Ethernet and Bluetooth connectivity, you can share waypoints, sonar data, and maps with other networked Humminbird units, as well as control your fishfinder remotely using the FishSmart app on your smartphone.
  5. User-Friendly Interface: The intuitive and customizable menu system of the Helix 7 makes it easy for anglers of all skill levels to access essential features and settings. With the option to split the screen into multiple panels, you can view sonar, GPS, and mapping data simultaneously, allowing you to make informed decisions on the water.

In summary, the Humminbird Helix 7 is a top-of-the-line fishfinder and GPS combo that offers exceptional performance, advanced features, and user-friendly operation. Its high-resolution display, powerful sonar capabilities, and extensive mapping options make it an invaluable tool for anglers looking to enhance their fishing experience and increase their chances of success on the water.


  1. High-resolution display: The Helix 7 features a 7-inch high-resolution display that provides clear and bright images, making it easy to read in various lighting conditions.
  2. CHIRP sonar technology: The device uses CHIRP (Compressed High-Intensity Radiated Pulse) sonar technology, which provides better target separation and higher resolution images of fish and underwater structures.
  3. GPS and mapping capabilities: The Helix 7 comes with built-in GPS and mapping capabilities, allowing users to accurately track their location, mark waypoints, and create custom routes.
  4. Easy-to-use interface: The user interface is intuitive and user-friendly, making it easy for both beginners and experienced anglers to navigate through the various features.
  5. Expandability: The Helix 7 is compatible with various accessories and add-ons, such as additional transducers and mapping software, allowing users to customize their setup to better suit their needs.
  6. Durability: The device is built with high-quality materials and is designed to withstand harsh marine environments.


  1. Price: The Humminbird Helix 7 can be relatively expensive compared to other fish finders and GPS combos on the market, which might be a deterrent for some users.
  2. Learning curve: While the interface is user-friendly, the device has numerous features that may take some time to master, especially for users who are new to fish finders.
  3. Limited mapping options: The included mapping software might not cover all regions or bodies of water, requiring users to purchase additional mapping software to fill in the gaps.
  4. Size and weight: The Helix 7 is larger and heavier than some other portable fish finders, which might be a concern for users with limited space on their boats or kayaks.

Lowrance HDS-Live Fish Finder

Lowrance HDS-Live Fish Finder

Introducing the Lowrance HDS-Live Fish Finder, the ultimate angling companion for both professional and recreational fishermen. With its cutting-edge technology, user-friendly interface, and extensive mapping capabilities, the HDS-Live is designed to elevate your fishing experience to new heights.

Key Features

  1. Multi-Touch Screen: The Lowrance HDS-Live Fish Finder boasts a high-resolution, crystal-clear multi-touch screen, allowing for seamless navigation and interaction with the device. Its responsive touch controls make it easy to access features and settings, ensuring that you spend more time fishing and less time fiddling with your device.
  2. Live Sonar Compatible: The HDS-Live is compatible with Lowrance’s revolutionary LiveSight Sonar technology, which provides real-time, high-resolution images of fish and structure beneath your boat. With LiveSight Sonar, you can see fish as they swim and react to your lure, giving you an unparalleled advantage in locating and targeting fish.
  3. Preloaded C-MAP US Enhanced Mapping: The HDS-Live comes preloaded with C-MAP US Enhanced Mapping, providing you with detailed, accurate charts of thousands of lakes, rivers, and coastal areas across the United States. These maps are constantly updated to ensure you have the most current information at your fingertips, and they can be further customized with your own waypoints, routes, and trails.
  4. Advanced Fishfinding Features: The Lowrance HDS-Live is packed with advanced fishfinding features, including CHIRP Sonar, StructureScan 3D, and FishReveal. These technologies work together to provide a comprehensive view of the underwater environment, helping you to identify fish, structure, and bottom composition with ease.
  5. Wireless Connectivity: With built-in wireless connectivity, the HDS-Live allows you to easily connect to the internet, download software updates, and share data with other compatible devices. This makes it simple to stay up-to-date with the latest advancements in fishfinding technology and ensures that you always have the most accurate information at your disposal.
  6. Customizable Interface: The Lowrance HDS-Live Fish Finder is fully customizable, allowing you to tailor the interface to suit your personal preferences and fishing style. With the ability to add, remove, and rearrange widgets, you can create a unique, personalized experience that maximizes your efficiency on the water.

The Lowrance HDS-Live Fish Finder is a powerful, versatile, and user-friendly device that is perfect for anglers of all skill levels. Its advanced features, superior mapping capabilities, and customizable interface make it an invaluable tool for anyone looking to improve their chances of success on the water. Don’t miss out on this game-changing fishfinder – invest in the Lowrance HDS-Live today and experience the difference for yourself.

Pros of Lowrance HDS-Live Fish Finder:

  1. High-resolution multi-touch screen: The Lowrance HDS-Live Fish Finder comes with a high-resolution, easy-to-use multi-touch screen that provides a clear and detailed view of the underwater environment.
  2. Live sonar compatible: The device is compatible with Live Sonar technology, which offers real-time views of fish movements and structures beneath the water’s surface, allowing anglers to react quickly and make better decisions.
  3. Preloaded C-MAP US Enhanced Mapping: The fish finder comes with preloaded C-MAP US Enhanced Mapping, which covers inland and coastal waters in the United States, providing users with detailed information on fishing spots, marinas, and other points of interest.
  4. Customizable interface: The HDS-Live Fish Finder allows users to customize the interface, ensuring that they have quick access to the features and functions that are most relevant to their needs.
  5. Wireless connectivity: The device features built-in Wi-Fi, allowing users to connect to the internet and download software updates, map data, and other information, without the need for additional hardware.
  6. Integration with other devices: The HDS-Live Fish Finder can be integrated with other Lowrance devices and accessories, such as radar, autopilots, and other navigation tools, creating a comprehensive marine electronics system.
  7. Superior target separation: The fish finder offers excellent target separation, allowing users to easily distinguish between individual fish, bait schools, and structures, even in crowded and challenging environments.

Cons of Lowrance HDS-Live Fish Finder:

  1. Price: The HDS-Live Fish Finder is a high-end device, and its price tag reflects this. It may not be the best option for casual anglers or those on a tight budget.
  2. Learning curve: With its numerous features and customization options, the device may have a steep learning curve for some users, especially those who are new to fish finders or advanced marine electronics.
  3. Size and weight: The HDS-Live Fish Finder is a relatively large and heavy device, which may make it less suitable for small boats or kayaks.
  4. Limited coverage of international waters: The preloaded C-MAP US Enhanced Mapping covers only the United States, so users who fish in international waters will need to purchase additional maps.

Raymarine Axiom Pro 9 RVX Chartplotter

Raymarine Axiom Pro 9 RVX Chartplotter

The Raymarine Axiom Pro 9 RVX Chartplotter/Fishfinder [E70371], an advanced marine navigation system designed to enhance your on-water experience. Packed with state-of-the-art features and cutting-edge technology, the Axiom Pro 9 RVX is the perfect companion for fishing enthusiasts, seasoned boaters, and casual cruisers alike. With its user-friendly interface, unparalleled performance, and versatile capabilities, this device is a must-have for any modern vessel.

Key Features

  1. High-Resolution 9-inch Display: The Axiom Pro 9 RVX features a stunning 9-inch, multi-touch display that is easy to read in direct sunlight and provides crystal-clear images. Its optically bonded LCD delivers sharp contrast, vibrant colors, and wide viewing angles for an enhanced user experience.
  2. RealVision 3D™ Sonar: Utilizing advanced technology, the Axiom Pro 9 RVX offers superior underwater imaging capabilities. RealVision 3D™ Sonar provides a comprehensive view of the seafloor and structure, allowing you to identify fish, bait, and potential hazards with ease.
  3. RVX All-In-One Transducer: The included RVX Transducer combines CHIRP SideVision, CHIRP DownVision, high-frequency CHIRP, and RealVision 3D into a single, compact unit, simplifying installation and ensuring optimal performance.
  4. Navionics+ and Lighthouse Chart Support: The Axiom Pro 9 RVX is compatible with a wide range of chart formats, including Navionics+ and Lighthouse charts. This allows you to navigate with confidence, knowing that you’re using the most accurate and up-to-date information available.
  5. Superior GPS Accuracy: The Axiom Pro 9 RVX is equipped with a 10Hz GPS/GLONASS receiver that provides rapid position updates and exceptional tracking accuracy, making it easier to navigate through tight spaces and stay on course in challenging conditions.
  6. Advanced Network Connectivity: With built-in Wi-Fi and Bluetooth, the Axiom Pro 9 RVX seamlessly integrates with Raymarine’s family of networked devices, including radar, AIS, thermal cameras, and more. This allows you to create a fully customized system tailored to your specific needs.
  7. User-Friendly Interface: Featuring Raymarine’s intuitive LightHouse 3 operating system, the Axiom Pro 9 RVX offers a simple, yet powerful user experience. Easily access your favorite apps, customize your home screen, and take control of your on-water adventures with just a few taps.
  8. Rugged, Waterproof Design: Built to withstand the harshest marine environments, the Axiom Pro 9 RVX boasts an IPX6/IPX7 waterproof rating and a rugged, all-glass front that is both stylish and durable.

Upgrade your vessel with the Raymarine Axiom Pro 9 RVX Chartplotter/Fishfinder [E70371] and experience the ultimate in marine navigation technology. Whether you’re chasing trophy fish, exploring new cruising grounds, or simply enjoying a day on the water, the Axiom Pro 9 RVX has you covered.


  1. High-resolution display: The Axiom Pro 9 RVX features a 9-inch, high-resolution display, providing clear and vibrant images even in bright sunlight.
  2. HybridTouch™ technology: This device offers the convenience of touchscreen control and the reliability of a physical keypad, allowing for seamless operation in different weather conditions and situations.
  3. RealVision 3D™ technology: Equipped with advanced sonar capabilities, the Axiom Pro 9 RVX offers a comprehensive view of the underwater world with high-resolution 3D imaging, making it easier to locate and track fish.
  4. CHIRP technology: The Axiom Pro 9 RVX uses CHIRP technology for improved target separation and better fish identification at greater depths.
  5. Integrates with multiple systems: This device can be easily integrated with other Raymarine instruments, autopilot systems, and even entertainment systems, making it a versatile addition to your boat’s electronics.
  6. Customizable interface: The Axiom Pro 9 RVX offers a user-friendly interface that can be customized to suit individual preferences and needs.
  7. Rugged construction: Built to withstand harsh marine environments, the Axiom Pro 9 RVX features a durable and waterproof design.


  1. Price: The Raymarine Axiom Pro 9 RVX is a high-end device, which may be a bit pricey for some budgets.
  2. Learning curve: While the user interface is customizable and user-friendly, it may take some time for first-time users to get familiar with all the features and functions.
  3. Size and weight: The 9-inch display and rugged construction may make this device slightly larger and heavier than some other chartplotters/fishfinders on the market.
  4. Additional costs: To unlock the full potential of the Axiom Pro 9 RVX, you may need to purchase additional accessories, such as transducers or compatible maps, which can add to the overall cost.

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