Nautical blog

Radar: Should you throw away your old "microwave" radar to switch to Doppler?

If your radar is more than 10 years old, you're navigating with the equivalent of a cathode ray tube television in the 4K era. Technology has changed, and for once, it's not just marketing hype. For decades, radar was that large, heavy, energy-guzzling dome that was only switched on in thick fog for fear of draining the batteries. Today, "Solid State" (pulse compression) technology has changed everything. Here is the Atelier's frank analysis to help you decide if the investment is worthwhile for your program. 1. The Old School: Magnetron Technology This is probably what you have on your mast if your equipment is from before 2015. The principle: A vacuum tube (magnetron) sends very powerful pulses (2kW or 4kW). It's literally the same technology as your microwave oven. The problem: It consumes a lot of power (your battery bank suffers), it's dangerous for your health if you're too close (radiation), and there's a 90-second warm-up time. The advantage (still): In very heavy weather, an old 4kW magnetron sometimes "pierces" the driving rain better over very long ranges than a modern entry-level radar. 2. The Revolution: The "Solid State" / Doppler (Halo, Fantom, Quantum) The new radars (B&G Halo, Garmin Fantom, Raymarine Quantum) no longer use a magnetron. They are purely electronic. Ridiculously low power consumption: They consume barely more than a navigation bulb (20 to 40W). You can leave it running continuously, even while sailing. Instant On: Zero preheating time. You press, it works. Safety (Zero Radiation): They emit fewer waves than a mobile phone. They can be installed on a stern mast or gantry without "cooking" the crew. 3. The "killer feature": The Doppler effect This is the argument that makes us say "yes" to change. Doppler technology analyzes the echo frequency to colorize targets in real time. Red Target: It is getting closer to you (Danger). Green Target: It's moving away (Safety). In a congested channel or at night, it provides immediate visual assistance. You no longer decipher a blurry yellow blob; you instantly see who the threat is. 4. Close-range detection: Day and night Older radars were blind for the first 50 meters (the magnetron's "dead zone"). Newer radars see everything, even down to 6 meters. Workshop test: With a modern radar (like the B&G Halo 20+), we can distinguish a lobster pot buoy or a kayaker in the fog 20 meters from the boat. This is impossible with an older generation. ⚠️ The installation trap (Read this carefully) The classic boater's trap is to think: "It's easy, I unscrew the old dome and screw on the new one." This is wrong. The cable is different: New digital radars don't communicate via old analog cables. It's essential to unstep the mast or use a messenger line to run the new Ethernet/power cable. That's 80% of the work. Mast adapter: Mounting hole spacing has often changed. You will likely need an adapter plate (Scanstrut or custom-made) to avoid drilling new holes in your mast support. 💬 The Workshop's Opinion Is it essential? If you are doing low-level driving during the day in summer: Keep your old radar (or no radar at all). If you're sailing at night, crossing the Channel, or planning a trip: The mental comfort of Doppler and its low power consumption are life-changing. It's a major active safety feature. Our advice: Don't throw away your old multifunction display too quickly. First, check if it's compatible with the new domes via a software update. Otherwise, you'll have to replace the entire unit. 👉 Need to check the compatibility of your current screen? Send us the reference number and a photo of your connectors.