How Sonar Works in Fish Finders — and Why It Matters

Fish finders use sonar—short for “Sound Navigation and Ranging”—to detect what's beneath your boat. The transducer sends out sound waves that travel through the water, bounce off fish, the bottom, or structures, and return as echoes. These echoes are processed and displayed on your screen as shapes, arches, or detailed terrain.

Modern fish finders go beyond basic sonar with advanced features:


: Instead of sending a single frequency, CHIRP (Compressed High-Intensity Radiated Pulse) sonar sends a range of frequencies for greater detail and clarity. You'll get better target separation—making it easier to distinguish between fish and structure.


: This uses high-frequency sonar for crisp, photo-like images directly beneath your boat. It’s perfect for seeing structure, vegetation, or fish holding close to the bottom.


: Ideal for covering more water, side imaging scans out to the left and right of your boat. It gives you a wide-angle view, so you can locate fish and features without driving right over them.

Together, these sonar technologies turn your fish finder into a powerful underwater mapping tool—helping you fish smarter, not harder.

What to look for in a Fixed Mount Marine Radio

Choosing the right fixed mount VHF radio is essential for safe and reliable marine communication. Whether you're cruising offshore or navigating coastal waters, here's what to consider when picking the right unit for your boat:

Transmission Power: Most fixed mount radios offer 25 watts of power—ideal for long-range communication with other vessels and the Coast Guard.

DSC (Digital Selective Calling): A must-have safety feature that lets you send automated distress signals with GPS location, even if you're unable to speak.

Built-in GPS: Some models come with GPS integrated—perfect for accurate DSC distress calls and tracking.

Waterproof Rating: Look for radios with IPX7 or IPX8 ratings for resistance to water exposure and spray.

Display and Controls: A bright, easy-to-read screen and intuitive controls are crucial in rough conditions.

NMEA Connectivity: If you're connecting your radio to chartplotters or other onboard electronics, make sure it supports NMEA 0183 or NMEA 2000.

Bonus features like weather alerts, dual/tri-watch, foghorn mode, and second-station compatibility can add extra convenience and safety. Match your choice to your vessel size, navigation habits, and communication needs.

Need help choosing? Contact us or browse our top-rated fixed mount VHF radios below.

What to look for in a Handheld VHF Marine Radio

Handheld VHF radios offer portable, reliable communication whether you’re kayaking, sailing, or using them as a backup to a fixed unit. Choosing the right model means balancing size, features, and durability. Here's what to consider:

Power Output: Most handhelds offer 1–6 watts. Higher wattage means greater range, but also uses more battery—look for models that let you switch between low and high power modes.


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Selecting the Right Antenna

Explore Our VHF Antennas Collection

Reliable communication is critical on the water, and it all starts with a high-quality VHF antenna. Our curated selection of marine VHF antennas is built to keep you connected, whether you're offshore, in the harbor, or navigating along the coast. Exceptional Signal Clarity: Choose from top-rated antennas designed to maximize transmission range and reception. Durable Marine-Grade Materials: Built to withstand saltwater, sun, and rough seas. Fits All Vessel Types: Options available for sailboats, fishing boats, yachts, and center consoles.From compact 3-foot models for smaller boats to 8-foot high-gain antennas for long-range communication, you’ll find the perfect solution to suit your needs. Browse trusted brands and equip your vessel with a VHF antenna that delivers performance when it matters most.Stay safe. Stay connected. Shop our VHF antennas today.


Pairing a VHF radio with an antenna involves choosing compatible hardware and ensuring proper installation for optimal signal performance. Here's a clear step-by-step guide:


1. Match the VHF Radio and Antenna Type

VHF marine radios operate on the 156–162 MHz frequency range.

Make sure your antenna is rated for marine VHF frequencies (not UHF or CB).

2. Choose the Right Antenna Length and Gain

3 ft (low gain, ~3 dB): Great for small boats or sailboats with rocking motion.

8 ft (medium gain, ~6 dB): Common for most powerboats.

Over 8 ft (high gain, ~9 dB): Best for tall mounts and stable boats.

Tip: Higher gain = longer range on flat water, but lower tolerance for boat rocking.

3. Select the Correct Mount

Match the antenna base to your chosen mount (standard 1" x 14 thread is common).

Ensure the mount is appropriate for your boat (rail mount, ratchet mount, etc.).

4. Use the Right Coaxial Cable and Connector

Use RG-58 coaxial cable for runs under 20 ft; RG-8X or RG-213 for longer runs.

Avoid splicing the cable. If you must, use proper connectors.

Install a PL-259 connector on the radio end to fit the radio's SO-239 socket.


5. Install and Connect

Mount the antenna vertically and as high as possible (VHF is line-of-sight).

Route the cable away from power wires to avoid interference.

Connect the PL-259 plug from the antenna cable to the back of the radio.

6. Test the Setup

Power on the radio.

Perform a radio check (channel 9 or 16 is for distress/emergency—use channel 72 or 69 for checks).

Or use a SWR meter to test signal reflection/loss.

Best Practices

Ensure waterproofing at all connections with shrink tubing or sealing tape.

Regularly check for corrosion and wear, especially in marine environments.


If you share your VHF radio and antenna models, I can double-check compatibility or suggest the best pairing.


What to look for in a Antenna Mount

Ensure your VHF antenna performs at its best with the right mounts and accessories. Proper installation is key to signal clarity, range, and long-term durability—whether you're outfitting a center console, sailboat, or offshore fishing vessel.

✔️ Adjustable Mounts: Swivel, ratchet, and quick-release options for easy positioning and stowage

✔️ Heavy-Duty Materials: Built from marine-grade stainless steel, nylon, and reinforced fiberglass for strength and corrosion resistance

✔️ Essential Accessories: Cables, connectors, extension mounts, and more to complete your setup

Our collection includes universal and brand-specific components compatible with popular VHF antennas. Whether you're upgrading, replacing, or starting fresh, these parts ensure a secure and optimized installation every time.

Get the most out of your VHF system. Shop quality antenna mounts